adding the A380:

18A - Airbus A318
19B - Airbus A319 (G-EU**). Can also be 19C.
M9A - Airbus A319 (G-DBC*)
M0A - Airbus A320 (G-MID*)
B0A - Airbus A320 (G-MEDK)
20D - Airbus A320 (G-EU**/G-TT**)
21A - Airbus A321 (G-EUX*)
M1A - Airbus A321 (G-MED*)
38A - Airbus A380-800 (G-XLE*)

73A - Boeing 737-400
74C - Boeing 747-400 (Mid-J). Can also be 74D, 74I or 74J.
74G - Boeing 747-400 (High-J). Can also be 74A
47A - Boeing 747-400 (High-J Lite). Can also be 47B, 74E or 74K.
76B - Boeing 767-300 (Short Haul)
76Z - Boeing 767-300 (Long Haul)
77X - Boeing 777-200 (G-ZZZ*)
77A - Boeing 777-200IGW (G-VII* 3 Class Configuration)
77C - Boeing 777-200IGW (G-VII* or G-RAES 4 Class Configuration) Can also be 77D or 77E.
77F - Boeing 777-200ER (G-YMM* 4 Class Configuration)
77S - Boeing 777-200ER (G-YMM* 3 Class Configuration)
77N - Boeing 777-300ER

ER7 - Embraer 170
ER9 - Embraer 190
S20 - SAAB 2000

75V - Boeing 757-200 (F-HAV*)
75X - Boeing 757-200 (F-GPEK)