As others have said, BR blue was what I grew up with, my 'proper' interest in railways starting in 1971 when I went to secondary school. As to those who say the BR Blue period was boring - The only boring thing was the uniform livery (which after all is only a coat of paint). Thinking back to the my favoured 1972-1980 period; The variety of loco and unit classes, the quantity of freight vehicles (unbraked, vacuum braked and air braked), the number of freight terminals, eg collieries, steelworks, etc; The number of shunting locos still required, and all those depots, some well-known and others obscure (eg Blyth Cambois).
Getting a bit philosophical, part of the wonderful memories is the thrill of discovering new things, eg visiting Reddish Depot or Tinsley Yard for the first time, or, for a southerner, the ultimate dream of a family holiday in Scotland! I do believe that as we grow up and become more affluent, experienced and knowledgeable, such excitement (as far as railways are concerned at least) becomes much rarer. Hence, perhaps, the froth each year over Hornby and Bachmann's announcements !