How far is the Chunnel Euro Star train station in Brussels to the station where we would catch a train to Bruges?
Sorry - I had not read other posters that you do not call the Eurostar train by "Chunnel". I now know.
You won't need to change stations. You'll arrive at Bruxelles-Midi and you can depart from Bruxelles-Midi.
Pretty well all trains from Brussels to anywhere else in Belgium stop at Midi.
Thank you for the info folks.
Yup, you arrive on one platform, go to the front of the train or the middle where the nearest ramp or escalator is, go downstairs, then check the departure boards (there's also a large round information booth) and go up the escalator to the platform to the Oostend or Brugge train. Its a matter of dozens of metres rather than hundreds. If you've got a few minutes between trains there's plenty of shopping in the station, including a supermarket (GB, the last I looked but I think it is (has) changed to Carrefour) and a tasty burger chain restaurant called Quick.