In reply to Aaron Lines:
Hi Aaron,
I'd recommended getting a referral to an orthotics dept as there are several specialist knee braces designed to help with this sort of issue.
They vary in levels of support,comfort, cost etc therefore its worth seeing someone qualified in that area to ensure the correct one is selected for you.
They can be pretty costly, so you probsbly wouldnt want to order one online, but they are routinely prescribed in the NHS. Well for now, anyway
Emma