repair flip switch, 6822?

My 6822 decided it dosent like being in norlam mode yesterday,

it's stuck in flip mode even with the flip closed, i.e. screen rotated 90
degrees, front keys inactive, unable to use camera etc.

Occasionaly if i snap the flip closed it'll go back to normal mode for half
a second, then go to flip mode again and stay there.

obviousely the switch/sensor for the flip location has gone.

Anyone know if this is repairable? roughly how much it should cost to fix,
and a recomendation of a good place i can send/take the phone to have it
fixed, i'm near nottingham, in the the UK, idealy i'd like to be able to
drop it off, and pick it up, but will post it if i have to.