Saturday afternoon's a bit of a wasteland. On the Main Stage The Enemy are having their sound whipped into farty dissonance by a harsh cross-wind. And in the Big Top (the only other stage at Isle Of Wight) there's, erm, Andy Lo Russo, The Singing Chef.

Perhaps that's why such a vast and enthusiastic crowd has assembled for Foals' Edwin Congreave's DJ set in Strongbow's Bowtime Bar.

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Nestling between Rimmel's free makeover enclosure and BT's broadband-enabled Chillout Zone – the latter being full of booze-blasted teens silently watching their phones recharge – it's a depressingly corporate environment. The bar staff all dance about wildly as they pour the drinks – presumably because some shark-eyed 'experiential marketing' exec has threatened to dock their wages if they don't.

The branding even extends to the DJ booth, which means Congreave spends the entire set looking like he's standing inside a giant pint of cider. It's undignified.

To his credit, though, the Foals man transforms this sterile environment into something approaching a party, thanks to a speaker-rattling electro set that takes in Simian Mobile Disco's 'I Believe', Klaxons' 'Gravity's Rainbow' and Cut Copy's 'Hearts On Fire'.

In fact, by the time he's finished there's a startling level of debauchery going on. In one corner there's a gang of wild-eyed blokes dressed in Bavarian folk costume, pogoing like maniacs. Close by, another cider-casualty is busy scribbling song lyrics on his own face in marker pen. And everywhere you look people are surreptitiously fishing things out of small clear plastic bags as the late afternoon sun blazes down outside. It's an exhilarating spectacle, and undoubtedly the most fun to be had at Isle Of Wight this afternoon.

You do wonder, though, looking at the owlish, dinner-plate-eyed expressions of those on the dancefloor, if it's entirely sensible to have taken quite so many drugs by 5.30pm. I mean, how on earth are they going to make it through to The Australian Pink Floyd?