So I've just received my 1st Advance tickets for June, with reserved seats in coach L. I'm cautious about this however. If there is a coach L, that would imply that there are now 12 coaches on FGW Swansea - Cardiff - London services (A, B, C , D, E , F , G , H , I , J , K, L) which there obviously isn't.
Will I definitely have a reserved seat? My faith in the new First class arrangements on FGW hasn't been helped by my experience travelling back from London -- Cardiff before Easter, when I had a 1st advance reservation in coach G, yet coach G was missing from the train so I was literally squeezed into coach H.
If first class on FGW is now going to be cattle class with some added leg room and refreshments, I might go standard in the future