EGDR,
Phone the CAA Medical Centre on 01293 573700 and just make an appointment for a Class 1.
Then get your cheque book out !!
But yes..do it first, normally no problems, but I have experienced that awful feeling with days to go to my start date at OATS 13 years ago only to find out that a blip on my EEG meant that I could not get a Class 1.
Still, here I am thirteen years later and back on the right track.
Good Luck