You sound like an amalgam of me and my father. Dad was a long-term train fanatic - he even used 'mallard' in his email address - and hated birds, whereas I never could get interested in trains but used to breed birds.
Apparently, Nigel Gresley was a keen bird watcher, and chose fast flying birds for the second batch of A4's. (Clearly, with Mallard ,pochard et al , the fast flying idea withered ! ) Anyway 'Golden shuttle' was not a bird ,and I shouldn't have mentioned it at all, as it isn't a birds name. So, Yorkie is tantalisingly close, but not there yet.
I'm sorry if it was too obscure, and appealed to too few of you. Anyway, the answer is that those in the group were all renamed to directors of the LNER. 3 others renamed to people were Golden Shuttle - renamed to Dwight D Eisenhower & Gadwall , and then Herring Gull - both renamed to Sir Ralph Wedgwood. Gadwall was destroyed in 1942. So, if BB would like to pose my picture question ( which I failed to do) I'll respond to the suggested answers.
I suppose so. It's 150mm tall (the picture is of it lying down). The diameter of the edge of the bell shape is 35mm.
Not at all right, but surprisingly close ! Sorry for the delay in responding, but I wasted most of yesterday travelling from Cheshire to WD17 and travelling back - even worse !
Some clues. It is used in an upright position with the bell shape at the bottom. The bottom edge of the bell is champferred ( is that spelt right) to be sharp.