Crikey, I'm getting a)nostalgic and b) very hungry reading this thread.
Things I remember and miss, including 'prompts' from other posters:
Pacers
Spangles
Mint Cracknell
Swiskit choc bars (TV ad, mid 70's 'Would you risk it for a Swiskit'?)...think they later became 'Picnics', but tasted different.
'Old Jamaica' choc bars
Boiled sweets individually welded into plastic shells (cost 2p)- used to take ages to eat them (not the plastic!!!)
Apeel orange juice
'Triple Deck' choc bars (plain, milk, white in layers)
Biscuit Yorkie
Cider Shandy 'Top Deck' cans of pop
Baked Potato 'n' cheese flavoured puffs
Baked Potato flavoured crisps
Dentyne aniseed chewing gum
Horlicks Tablets
'Merlin's Brew' mint choc iced lollies
Cider-flavoured iced lollies
Multi-layered 'Jawbreakers' (may still do?)
'Fish & Chips' mini biscuits
AND 'PROPER' SMARTIES!

Teenage Mutant Ninja Turtle Apple Mini Pizzas (actually, that's a bit of a 'red herring'...they were vile and my local Tesco couldn't give them away eventually!)
As you can see from above, I have a sweet tooth. Thankfully, there are now these shops/stalls opening up where they specialise in 'childhood favourites' sweets. They locate them from all over the country---thing is, you pay extra for the privilege!!!
Finally, there was this hot dog topping that was discontinued only a few years back. It was striped ketchup and mustard in a tube (bit like toothpaste). My family loved it with hot dogs and then it disappeared. Can't remember who the manufacturer was, either.