I've booked Eurostar tickets from London to Cologne at the end of March. I now find there is an international dentists convention in Cologne when we arrive. It has been suggested that I switch to Düsseldorf, as accommodation is either very limited or astronomical in Cologne. I tried to change Eurostar tickets but they will not change destination. I can see that our train goes to Dusseldorf in any event. Should I just book tickets to Dusseldorf from Cologne on DB, and stay on the train?
Any advice please?