Yeah he's into cocks...at least talking about them.
On The Friday Night Project he said Ainsley Harriot (UK TV Chef) is "Hung like a f'in donkey."
The interviewer said 'why is he always smiling' and Jamie said "Listen mate, if you had what he has in his pants, you'd be smiling too!" [Jamie saw him at the urnial at some charity do or something]
Another to add to the list
As for Jamie, on The Frank Skinner show, some time ago, Frank brought on a part of Jamie's wardrobe that he had in his house when he was a teenager (that had been chucked out).
On it was a drawn picture of a big cock and small balls with 'BIG COCK SMALL BALLS' written under it in big writing. It was Jamie's, he admitted it.
Therefore...big cock, small balls. Not sure of actual figures but 8x6 seems fitting? The observations and ramblings of a straight guy. He's most likely uncut too, like myself.