Loads of the ads already mentioned from the '70s and '80s..
One I don't think anyone has mentioned is the 4711 ad from the late '70s. I've just played the ad for some '70s nostalgia.
The Impulse ads - "When a man you've never met before suddenly gives you flowers, that's Impulse".
The Bodyform ads. All together now - "Wooooaaaah, Bodyform, Bodyform for youuuuuu".
Kelloggs Country Store - "Bring me apples, bring me honey, bring me hazelnuts, bring me wheat, Bring me good things to eat. With Kelloggs Country Store".
Kelloggs Bran Flakes "They're tasty, tasty, very, very tasty - so very tasty".
Alphabites
"A is for Alpha
B is for Bites
C for yourself that they taste just right
D is for dinner
E is for eggs
F's for fishfingers or even frogs legs"
Coke ad - "First time, first love"
Le Piat D'or - "The only French you'll ever need"
The ads were great back then - like mini movies. We were a captive audience because there was no way to fast forward the ads or skip them. You had to sit through them or go put the kettle on and make tea.
If you have a look on YouTube, you'll find some '70s and '80s ad compilations.