I recently bought Rail and Sail advance tickets for travel from London to Dublin Ferryport via train to Holyhead then Irish Ferries to Dublin. As suggested on seat61 I used the Transport for Wakes site which went fine until I tried entering my credit card information which was rejected. I suspect it might have had problems with my billing address which is obscure and not in many address databases. Fortunately they also take Paypal so I was able to pay that way.
Just thought I would note my experience for anyone else trying to buy UK tickets from the US
Just thought I would note my experience for anyone else trying to buy UK tickets from the US