FWIW: For our Baltics cruise, we took the train from Victoria Station in London to Dover. I will NEVER do that again. I was traveling with my mother and therefore was solely responsible for tossing 5 suitcases on the train, getting us seated, and retrieving those same 5 suitcases when arriving in Dover. There was no such thing as "checking" anything. I never saw anyone who remotely looked like they could help, either in London or in Dover. NO MATTER WHAT THE COST, I will never do that again but will hire a private car or service. It's worth it to me.
Margie in Houston