Rohan;
Take a look at the CAA's standards at:
http://www.srg.caa.co.uk/pld/med/med..._1_medical.htm
It says correction of long sightedness is not acceptable but doesn't say that for short sightedness. You ;;;should;;; be alright. I thought a £20 eye test at boots along with a printout of their standards was a good plan before forking out £400 for the CAA medical.
Good luck!
SS