Big Bore Head Gasket UK

[GordonC]

I am new here and I have recently obtained a CB72 which had been lying unused in a garage for many years. After dismantling the top end I found it has a big-bore conversion which I believe is from Read-Titan. The bores are 64mm but I need a compatible cylinder head gasket for the rebuild. Can anyone suggest where I might obtain one, in the UK preferably? I am thinking I will need to either make one or get one made out of copper but I would appreciate hearing if anyone else has managed to find another solution.