54-12-21 and 55-xx-xx Final Problem were 55-04-17
56-04-24 Empty House was 55-04-24
580406 The Hound Of The Baskerville was likely 61-08-05 b/c it was in 3 parts instead of 6.
61-03-05 Black Peter was 69-07-01. The 1961 version was adapted by Alan Wilson while Michael Hardwick adapted the 1969 version. The 1961 version is not in circulation but does exist.
61-08-21 Solitary Cyclist was 64-08-21
64-09-09 Retired Colourman was 64-10-09