I need a roll of seal for the boiler panel on a Myson Orion 50b gc 4178996?

My old myson is fine apart from a break in the seal. british gas have it on their 3 star cover and just condemned it claiming they cannot get the seals from Myson as they are no longer manufactured. The usual ploy by BG to get us to to buy a boiler from them.

Is there a roll of this seal anywhere on a pallet anywhere in the world I can get hold of? I'm out of work at the moment and this could not happen at a worse time for mwe financially for the sake of a stick seal costing a few quid only or less so if I can get the seal my corgi registered plumber friend said he would fix and get my boiler back on. Anybody help?