Holsten Export in The Stanley Portslade in 1987 (underage of course), I then swapped to Watneys special bitter, because it was about 15p a pint cheaper. Have drunk bitter ever since.
It's obviously not as good as it was, but being a huge Beatles fan, I had to go and see him before he eventually gives up touring. The show was over 3 hours and he was joined on stage at the end with Ringo Starr & Ronnie Wood, so that was an added bonus.