Thanks Marcel. I did try Startright but they didn’t have one and told me that they don’t keep many spares now.
I have a problem with the fuel gauge sender unit so I asked Hyospares if they stocked a gasket for it. They just asked me to provide a photo of the item I required. I thought if they don’t know what a fuel gauge sender unit gasket looked like then there was no point is continuing. So, if anyone knows where I could get a gasket I’d be very grateful (again)!