Despite the factor 30 (couldn't find any factor 35 this summer) I have a badly sunburnt left elbow today. Having thought about it, I put this down to yesterday's trip having been clockwise around southern Oxfordshire, northern Wiltshire and eastern Gloucestershire, keeping the sun permanently on my left elbow. Either that, or I didn't quite get around to plastering the elbow with sunblock.
I was out in the same area - you weren't the guy in the Euskatel kit, I suppose? I went a bit pink in the evening but I'm OK today.