I don't know what my first crisp was, but my mum always had Smiths salt n shake, so they probably featured.
Smiths did actually try the same concept with flavoured crisps for a while - flavour 'n' shake - you got a small sachet of, say, cheese & onion flavouring, to open and sprinkle before...
Given the ages of most of us, it would be remiss for this discussion not to mention how salt & vinegar used to be blue, with cheese & onion being green.
Then Walkers appeared and ruined everything.