For some unknown reason the price of a ticket when travelling by Eurostar can vary depending on what you say your country of residence is.
If you follow these instructions you could make some savings on train fares with Eurostar. I can't see that this has been posted before but apologies if it has.
- Go to eurostar.com, enter "UK" as country of residence, check the fares
- close the Eurostar page
- now erase your cookies in Internet Explorer (in the "options" menu)
- go back to eurostar.com, select "Spain" as your country of reisdence. Compare the fares.
You will notice that Eurostar fares depend on your country of residence, and you'd better not say it is the UK/France/Belgium or you could be charged up to 30% more on a return ticket. There is no way for Eurostar to check your country of residence so you should not have any worries doing this.