One I remember, for all the wrong reasons, is the Watneys Red Barrel jingle.

Actually the only version I remember perfickly is the Real Ale Drinkers parody

" Whats the beer that makes you queer,
Watney's Keg Red Barrel,
It always is an awfull brew,
It always makes you want to spew,
So come along and join the crew,
Botcott Keg Red Barrel"

Gareth