I've had it confirmed this morning by an AME that I am outside the acceptable limit for the Class 2. That also puts rotary out of my reach I believe.
Thanks for all the responses. They've made interesting reading. The FAA route was initially promising, but I found this in the JAR guidance:
At revalidation or renewal examinations, an applicant experienced to the satisfaction of the Authority with refractive error not exceeding +5 dioptres or a high myopic refractive error exceeding -8 dioptres may be assessed as fit by the AMS
So that closes off that route. Looks like the NPPL for me then, which I'm sure will be fine. I've also seen on the NPPL website that they may be acceptable for flying in France soon, however, it also states an 'ICAO-level pilot medical certificate' will be required. Does this mean a Class 2 again?