Silver top engine rebuild and need to get head gasket, head bolts and exhaust gasket, anyone know the part numbers and best place to get them ?

You could try Raw Engineering or Fensport.

I have asked Mel at Raw a few times now..... Spoke to Fensport and was quoted £13 each for head bolts ???? Chap didnt seam to know what he was on about. May try them again and see if I get a sensible answer this time.