I noticed they've added a load of seasonal specials of comedy programmes.
Harry Enfield's Yule Log Chums: Should be in widescreen (shown as such every on year on Gold), uses 4:3 copy.
French and Saunders 1998-2002 specials: Should be in widescreen, use 14:9/4:3 copies (apart from the 1999 Easter special oddly).
A Bit of Fry & Laurie '1987 Christmas Special': Isn't a Christmas special at all, it's just the pilot that was shown on BBC1 on Boxing Day 1987. Britbox version cuts about five minutes out including an entire sketch, presumably this is the 30 minute edit that was shown the next year on BBC2
Also the 2006 Royle Family special 'The Queen of Sheba' is split into two parts for some reason.