A Brannock has me at a UK11 with a wide-ish fit, however my main issue appears to be that the instep and ball of my foot is quite thick.
I have a pair of derby brogues in the Forest last, UK 11, which fit okay (now). They caused me issues when I first got them, mainly because they were too small around the ball of my foot (suspect an 11.5UK would fit just fine - thoughts?). Fortunately they've stretched and whilst still snug, are now perfectly comfortable.
I'd love to see some shoes in the EEE Forest last but I've never actually come across any.