I've always loved the shape of the A4, and up to a few years ago I bought a lot of them. I tend to group them into 3 categories; the original release with tender drive and chunky valve gear (1), the 'halfway house' version with finer details but tender drive (2) and the modern SD version (3). That I can remember, I have these:
LNER Silver:
2509 Silver Link (3), 2510 Quicksilver (2), 2511 Silver King (2), 2512 Silver Fox (1)
LNER Garter Blue:
4483 Kingfisher (3), 4485 Kestrel (2), 4491 Commonwealth of Australia (3), 4498 Sir Nigel Gresley (3), 4462 Great Snipe (3), 4468 Mallard (2), 4500 Garganey (3), 4902 Seagull (1)
LNER Apple Green:
4493 Woodcock
LNER Wartime Black:
4466 Sir Ralph Wedgwood (2), 4901 Sir Charles Newton (3)
BR Blue:
60024 Kingfisher (3), 60022 Mallard (1)
BR Experimental 'Purple':
60027 Merlin (3), 60028 Walter K Whigham (1)
BR Green:
60003 Andrew K McCosh (3), 60014 Silver Link (2), 60025 Falcon (3), 60010 Dominion of Canada (1), 60030 Golden Fleece (2), 60031 Golden Plover (1), 60019 Bittern [Double Tender] (3), 60020 Guillemot (3), 60021 Wild Swan (3)