Bad news shades 
But, almost perfect running weather for me if it stays like it is
Long-sleeved Helly Hansen with a warm t-shirt on top and I'll be fine. Will stash a lightweight windproof into my pack just in case.
Looking forward to it now, had a great run there last year... I'll be the one religiously run/walking 25:5, so if you see me walking at around 3 miles don't worry - it's all part of the master plan!
Oh - and I'm doing the Exmoor Ultra this year, (AdventureHub and CTS ones as training for UTSW100 in June)
Edited: 22/02/2013 at 11:05