The Cambridge Rock festival at Wood Green animal shelter, Godmanchester near Huntingdon is a good place to ease a few down.
Especially if TAPFS are playing there as they did in 2007. One side of the arena is a long bar serving real ales, many different varieties with the barrels stacked up against the wall. Formerly known as the 'Rockin' Beerfest'.
Around these parts, I like a drop of Adnams 'Broadside' now and then, from the Adnams brewery at Southwold Suffolk.
I agree on the Adnams - was lucky enough to have a long weekend staying just outside Southwold last year and I was so impressed with the Adnams I had to keep buying more to ensure it was consistent from the first to the last. Not even a hangover the following day!! ;D