I'm thinking of taking my family (5 of us in total) from London to Cologne just before Christmas, travelling by Eurostar to Brussels then DB ICE from Brussels to Cologne. But, I read an account from another traveler who said there were no seats available on the ICE from Cologne to Brussels.
Eurostar do not allow me to reserve seats on the ICE leg of my journey. I could if I used Thalys instead of ICE but that seems a lot more expensive.
Can anybody reassure me that we should be able to find 5 seats close together on the ICE just before Christmas? Or alternatively suggest a booking service that will allow me to reserve ICE seats, but won't cost a lot more than booking the whole trip via Eurostar...?