I'm not an expert on color blindness, but doesn't a color blind person usually red and green as the same color instead of reversed?
Also even if Ensor has this problem, why use buttons that are red and green instead of other colors that he doesn't confuse?
Ensor sees Blake & Cally's green jackets and thinks they are red like emergency medical personel would wear, but he's in a room full of green plants. Does he think these plants have red leaves?

If I remember correctly, the flying computer is Orac, or at least an early prototype. So why doesn't it have the same voice as Orac later in the show?

There are now 8 members of Blakes 7.

I'm colorblind and I confuse blue and green. Do I think plants are blue? No, I learned when I was young that they were green. Color blindness can manifest itself as b-g, g-r, or r-b. Perhaps Ensor's colorblindness was more similar to mine, but I haven't seen the episode in years. Like 90% of my Doctor Whos, all my Blake's Sevens are on Beta, and the Beta machine has been repaired for the last time. *sniff* *sniff*

Sorry to hear about your tape machine.

So do you see blue & green as the same color or is it some kind of 'flip-flop' where a leaf will look green one day and blue the next?

Not exactly Blakes 7 related, but one of the main writers for the show, Chris Boucher, went on to create a show called Star Cops and in that show was a magical little supercomputer named Box, which is reminiscent of Orac.

Great line from this episode:

Travis is about to shoot Blake when Avon shoots off Travis' fake hand. One of the crew (can't remember who) says admiringly, "Great shot!"

Avon (with look of disgust): "I was aiming for his head."

I remember purchased a jacket that I had assumed was blue and wore it all spring until someone commented on my green jacket. Usually, I'm smart enough to question that if it looks blue or green, I might be wrong, but every now and then something gets by that never occurs to me to question. No, it doesn't flip-flop, though that could partly or completely psychological: if I know the jacket is green, my mind will file it away as green and won't check to update this schema since jackets don't change colors.

Ensor believes that Blake & Cally are medical personnel because he thinks they are wearing red outfits. Howeve, I believe the Doctor in Deliverance was wearing a brown outfit.

When heading to Aristo in the previous episode, Sevalan tells Travis, "No one must know anything about this." However at the end of this episode, Servalan seems like she's going to file charges against Travis for failing to get Orac & Blake. Something she didn't want the Federation to know about. Hmmmm...

Okay, apparently between the events of Deliverance & this episode (or possibly when Blake & Cally are flying back to Cephron) Blake recorded a log of what happened, but surprisingly, didn't seem to tell Avon, Jenna, Vila & Gan, because here he feels the need to playback his log for Avon.

The log has one innaccuracy. It shows young Ensor's ship spinning before the explosion, but the ship' spinning was caused by the explosion. Surprisingly Blake's log shows the life pods heading for the planet, and even has shots of the all the crew on the planet. I guess Liberator has some kind of automatic, flying camera that films their missions for posterity. ;-)

Avon says that Ensor's ship's log tells them that they were returning to Aristo. When did Avon or the others recover the ship's log?

Gan is, apparently, in Sick Bay, listening to the Bridge conversation about radiation poisening. I guess one of the crew accidentally pushed the shipwide communicator button and never turned it off.

Ensor refers to his computer as Orac, although this Orac has a nicer & more polite personality, than the one Blake gets.

Travis says, "Let's see the old man's map again." What old man's map? Young Ensor was 44, the previous 2 expeditions where never heard from again & two skeletons are found in the tunnels.
Frankly, why would Ensor give the Federation a map of the underground tunnels to get to the lab? If the Federation was coming to Aristo to make a deal for Orac, they would have made contact, not snuck in through a back entrance like thieves. So there is no reason for Ensor to give Servalan a map.

So why didn't Orac seize control of Servalan's ship like it did Liberator?

The reason that Orac can seize control of a computer is because all Federation computers use parts & concepts designed by Ensor, but the Liberator & Zen are not Federation built. Did the aliens who built Orac develop similar parts & concepts?

Jenna comments that a force that can seize control of Zen can control the ship, then Blake says, "Jenna, switch to automatics, then go rest in your cabin." Well, switching to automatics will certainly make it harder for an external souce to control the ship. [sarcasm mode off]

The force barrier changes position. Cally puts her hand up to it and a green line forms, but Blake puts his hand farther in and the green line forms closer to the edge of the TV screen.

In the previous episode Servalan doesn't want the Federation to know about Orac, and even has Travis to not list where they are going, but here Servalan says, "When we deliver Orac to the Federation..." I thought Servalan was going to use Orac to secretly take over the Federation, now she wants to give it to the Federation???

The Phibian grabs Servalan and she screams for Travis. I would expect Servalan to be armed and not act so much like a little girl (or a Doctor Who Companion. ;-)

In later episodes it isn't much trouble for one person to carry Orac, but here Ensor says that two people must carry it.

Cally & Blake each ask the weak & dying Ensor to help carry Orac.

Avon asks Vila to come to the teleport room, he does and Avon hands Vila a gun, Avon also has a gun. How did Avon pull two guns out of the gun holder (charger?) when Cygnus Alpha showed you could only pull one out at a time? (Well, he could have pulled one & set it down, or they could have been lying in the teleport room from a previous mission.)

I thought it strangely apt that a science fiction series would have a character wearing Moon Boots. ;-)

Earlier when talking about the Federation ship Orac or Ensor say something to indicate that the Phibians in the old city could be dangerous to the Federation 'visitors', but when Cally wonders if they are dangerous Ensor doesn't think the Phibians will harm them.

It sounds as if Blake calls Ensor, "Ensol" when talking to Travis & Servalan.

Avon is holding a gun on Travis and Servalan, then Vila walks in front of Avon so he has to raise his gun. Why didn't Vila walk behind Avon? If Servalan had a weapon she could have whipped it out and killed Avon & Vila while Avon's gun was raised.

Blake says, that they will send a message to the Federation telling them that Servalan & Travis let them have Orac. Given the dialogue of Deliverance, I would expect that the Federation's reponse would be, "What's Orac?"

Orac's voice on the ship is different than Orac's voice on the planet, and, I believe, different from Orac's voice in later episodes.

The S constellation that is seen in the next episode's replay of the prediction is not visible in the original prediction.

The S constellation is only seen when Avon orders a screen magnification. D'oh!

It really is a tactical mistake to let Travis & Servalan live. If they were dead, then the Federation would not know about Orac. However, since the Federation does know about Orac, they can work to overcome the weaknesses in their computer systems and keep Orac out.

Was Ensor based on Bill Gates, who also quite young when he invented a computing product which became a standard of computers?

Maybe Bill Gates was based on Ensor?

I think Gates formed Microsoft after this episode. (Not that there's a direct connection, I don't think. Hmmm, Microsoft as a tool of Servalan?)

Where did the seats come from which Blake & Avon sit on when looking at the log? Ensor could have survived if Blake had not bothered messing about with the roof.

Does anyone else struggle to accept that a ship with the best medilab around (according to Blake) has no decontaminent drugs??? By Avon's dialogue when the issue comes up, it seems that these forms of drugs are as common in the future as headache tablets nowadays.

Ensor could have survived if Blake had not bothered messing about with the roof. - Richard Davies

Two things- Blake believed they were being followed by Travis and Servalan, he had no idea that they had a map and felt that collapsing the roof would, at best, kill them and at worst, slow them down. He was also going on the advice of Ensor that he had a couple hours to live, so perhaps felt that a minute spent collapsing the roof would be ok.
The other thing is that Cally points out to Blake the entrance to the surface just as they reach Ensor's body. From the shot of the stairs (which I assume to be a Cally POV shot) it looks only a small distance and in clear visual sight of where they are standing. My point is why didn't either Cally or Ensor spot this when they first arrived at the area? Cally could have dragged Ensor to the surface with Orac and then gone back for Blake (She had no idea about Travis or Servalan (or Avon and Villa for that matter and assumed they were safe))

I thought Servalan was going to use Orac to secretly take over the Federation, now she wants to give it to the Federation???- KAM

My understanding (this is purely my hypothesis) is that she would get Orac in secret and then bring it back and say "Look what I'VE got! And it cost us NOTHING!!! (insert evil laugh here)"

When did Avon or the others recover the ship's log? - KAM
Probably from Ensor Jr's escape pod. Possibly it was found by Zen during a scan of the debris of the ship?

apparently between the events of Deliverance & this episode (or possibly when Blake & Cally are flying back to Cephron) Blake recorded a log of what happened, but surprisingly, didn't seem to tell Avon, Jenna, Vila & Gan, because here he feels the need to playback his log for Avon. - KAM
This saves us having to hear "Last week on Blake's 7....". It's a tactic they would use again and again throughout the series. It is what joined episodes 2 and 3 (In that instance it was the captain of the prison ship carrying Blake recording a log entry). Granted though, in the context of the story it makes little sense to do this. Why bother to record a log at all??? He's not working for anyone and Zen automatically keeps records of these sorts of things (fairly accurate ones given the footage he shows in this episode).

Does anyone else struggle to accept that a ship with the best medilab around (according to Blake) has no decontaminent drugs???

Well the Astras were androids. Maybe they didn't need them. (But then again, why would they need such a great medical lab? Or money for that matter?)

Or maybe Liberator was taken over by someone else, who'd used up all the decontaminent drugs before they had to abandon it prior to the London finding it. Maybe the fight the London picked up was the former crew trying to destroy the Liberator to prevent others suffering the same fate as their friends.

We've no idea how long Liberator was out there, or how many careful (or otherwise) owners it had .