BlueEagle - intially i thought I was within the limits for unaided vision but apparently I have astigatism in one eye that takes it slightly over the limit. I would be well within the limits for the renewal test. My corrected vision is fine.
They said I should come down for an eyesight first medical - i.e. if I fail the eyesight test I only pay £45 not the full £400.
I'm going down next Tuesday so wish me luck. I suppose if I fail I could investigate the FAA option. It will be a bit of a pain if I just fail because I want to instruct PPLs (initially at least) which you didn't used to have a class 1 for.