
This was admirably demonstrated to me very early on - my first beer, in fact. Hopshackle Hop and Spicy (4.5%abv) was the only beer from them that was on cask. Fulsome praise from the Reluctant Scooper made me think that anything by them would be fun. Sadly, Hop and Spicy was a dark brown ginger beer - a bit thick, muddy, and definitely not what I wanted as my first GBBF beer. I had a sip, and realising that this was taking up valuable units that might otherwise be expended on things that were more in my target drinking zone, asked the doughty volunteer barstaff to dispose of it.
Fyne Jarl (4%abv) proved to be exactly what I was after. My notebook says "Brilliant gold, lively, with persistent lacing. Softly spicy Saaz-like lemony aroma, soft on palate, with persistent pithy bitterness in the finish. Great" Wonderful beer, in great condition. Inveralmond Ossian (4.1%abv) was of a similar style, but "caramel, honey and vanilla on the nose. More honey in the swallow. Finishes with snappy biscuity malt. Nice". At this point, I lost patience with the layout of the British bars - breweries are listed alphabetically according to county of location, with no map of the bars in the festival programme [edit - I'm totally wrong about this - see Ed's comment below] - and hit Bieres Sans Frontieres.

But (perhaps sadly), one can't spend the whole day at GBBF in an anteroom being fed rare beers. Plunging back into the fray, my notes tell a tale of a man reaching the end of his capacity. Beck Brau Zoigl (5.8%abv) was possibly my beer of the festival. As I mentioned earlier, there are only so many units of alcohol that you can take on board, and I remember having three thirds of a pint of this. My notes say "yeasty, unfiltered liveliness, full of vanilla grain character, splendidly bitter finish".
Looking at my notes, and from memory, I also had a few American beers from cask, including Oskar Blues Pale Ale (6.5%abv) and Ballast Point Big Eye IPA (7%abv). Ballast Point was full of marmalade and tangerines, and in my opinion, needed to be chilled and force carbonated to show at its best. Oskar Blues was surprisingly good from cask, although from memory, it was better from can when I last tried it (in New York, 2007, with Cajun food).
Finally, a couple of beers that I only had sips of. American Flatbread Solstice Gruit (5.4%abv, beer of the festival for Impy Malting) was an interesting unhoppped curiosity - the way herbs had been deployed in place of hops reminded me of the Stone - Victory - Dogfish Head collaboration Saison du BUFF - eccentric and intriguing, but not necessarily something that I'd drink a lot of. The only other beer that was noteworthy (and not in a good way) was the dry-hopped Revelation Cat lambic, a beer that not only missed that mark in terms of flavour, but also had the texture of liquid that had been retrieved from a saloon bar spittoon.
*with apologies to Damien Hirst