The below aren't any kind of favourites of mine, but they help to fit the puzzle so...
N54 AB.CDE W001 FG.HJK, where .....
AB = No.50, 19th August 2012
CDE = No.13 19th July 1980 - no.31 22nd May 1999
F= No.9 on 3rd July 1982
G= No.10 on 13th April 1974
H= No.2 on 19th April 1997
J = No.17, 11th October 1980
K = No.3 on 18th August 1973 divided by half of no.17 on 11th July 1987.