The difference is that when we started out, most items in the Hornby and Lima ranges could be purchased with a few weeks' pocket money so it was easy to expand the set. Those ranges also incorporated a lot of contemporary items (31s, 37s, 47s, HSTs, Mk1/2/3 coaches, 86s, 87s, 90s, Pacers etc) so it was easy to recreate a lot of what I could see going past school every day. Now there are relatively few budget models available and no budget models of contemporary trains.