I like to think I'm impervious to advertising now, but from my more carefree days I remember the following, some are classics, others are awful, and some are neither, but all managed to worm their way into my subconscious.:-
The Guinness Surfer ad = made by a teetotal Art Director who'd never touched a drop of the stuff. If any U.K. ad could ever be described as 'iconic' that was. Didn't work for me, I'd once tasted it and spat it out, never to return to it!
Lloyds Bank Black Horse ads - again, didn't persuade me to open an account, but if I ever change from Nat West I think I'd go for them.
Renault Clio Nicole and Papa ads. Must have worked, on my third Clio, now ten years old! And, no, I don't have a daughter for anyone thinking that way!
Fairy Liquid- 'the hands that do dishes can be soft as your face with mild green,,,' should have ended 'fresh vomit' but somehow didn't. Not helped by having the innocuous actress Nanette Newman fronting it for a while.
Liquid Gold building society ads starring George Cole in his 'Minder' role, already discussed. Never opened a B.S. a/c but liked the series of ads.
Jewson building supplies, making full use of a caricature loudmouth builder shouting you could get 'the jewson lot' there. I wasn't their target audience, and maybe it worked for them?
Hamlet cigar ads= happiness is a cigar called Hamlet, with mood music from J.S.Bach and wreathes of smoke! Went on to the bitter end of tobacco advertising. Unimaginable now, but great ads. The idea MAY have evolved from the 'you're never alone with a Strand' cigarette ads from printed magazine days.
Cadbury's Fruit and Nut ads, featuring bow-tied Frank Muir with his famous lisp 'Everyone's a fruit and nutcase'.