In reply to D.botts87:
Sorry to hear you've been hit by the Monarch failure.
In my experience (40 years +) I've found that the weather is often best in Swanage. There is camping here
http://www.tomsfieldcamping.co.uk/ which is a shortish walk to the nearest crags.
Be aware that the grades can feel a bit on the hard side. I usually drop a grade at Swanage.
Portland also gets reasonable weather.
Pembroke, North Devon and Cornwall get better weather than many parts of the UK too, but it is not quite as reliable as Swanage.