I'm sorry but it is not going to happen. The requirements for passengers seated in exit rows comes from the CAA. I know some countries provide a specific exemption in their equivelant of the Disability Discrimination Act for the CAA regulations.
I believe exemption under the UK Disability Discrimination Act is provided under Section 19 for Provision of Services:
Yeah, I thought so. It just made me giggle a bit because we're not supposed to talk about stuff like that
Those rules also confirm what I already suspected that I can't sit in an exit row because I might not be able to move fast enough, or help with the door. but that is due to OTHER REASONS!