Computer exhibitions and shows - that takes me back. Being driven out by my Dad to hotels in places like Huddersfield or Grimsby, parking up and being directed to the conference suite. Desk after desk of Vic20's, Oric 1's and Dragon 32's were setup, each accompanied by a chap more than happy to talk about them at length. The BBC B's felt like the best built and eventually our primary school got one, whilst at home my parents splashed out god knows how much on a Dragon 32 which saw me through my youth.
Never had a ZX81, but Dad did borrow an '80 for a week or two from one of his younger colleagues. I still recall tuning it in to the TV.