https://en.wikipedia.org/wiki/Young_Sherlock:_The_Mystery_of_the_Manor_House

The Woman In Black:
Episode 5.
Aired on November 28 1982, incidentally five years before the birth of my beloved Karen Gillan.
It was sure a breakthrough when Sherlock determines has been manipulating time in the house concerned.
Interesting when preparations are made on what to do on a train station.

The Eye of the Peacock:
Finale.
Frankly a very disappointing finale with the villain getting away less than halfway through and the rest of it felt like it was padding.