Nibble's just got up (he was working til 0230 this morning) so I'm replying - his weight hasn't changed at all, nor has his waist measurement! (I think he looks sleeker, though!)
DTC, the fundraising bit was a big incentive, too, as the donors were relying on him! - he's got a JustGiving donation page so people supporting him have found the process not difficult (and they can add the Gift Aid too, doing it that way).