Telephone the CAA medical department to discuss it (their number should be on
http://www.caa.co.uk), but if I were at your age and already so close to the renewal limit, I would be rather concerned about going over the renewal limit before too long. The investment, both financial and mental, required to gain a professional licence is substantial, and you don't want to find yourself in a situation of losing your medical soon after you gain your licence, for example.