I've been riding through he winter (approx 2500 miles in all weathers) and although I clean the bike thoroughly after each mucky ride have noticed in the last couple of rides that the front brake pads occasionally appear to 'stick' to the discs after braking. It's not often and it doesn't lock the wheel, just creates enough drag to be disconcerting, then frees up after braking another couple of times and is ok again for a while.

Anybody experienced this before? I'm guessing the solution is just to strip and grease the callipers, but never had this kind of thing with any other bike in the past...

Welcome to the club - this happens for me throughout the winter - crud, salt, etc builds up in the calipers to the point where after wet weather/wash, the brakes lock on first thing every morning but free up after half a mile or stopping and rocking the bike backwards and forwards - fine after that and journey back but following morning, same again - only solution is to unbolt calipers, remove pads and an hour or so of cleaning, etc.