I understand that you can get the 2 for 1 offers if you show your rail ticket(s). Would this apply to a Britrail pass as well? How about Eurostar reservations (outgoing from London to Brussels). Thanks.

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I understand that you can get the 2 for 1 offers if you show your rail ticket(s). Would this apply to a Britrail pass as well? How about Eurostar reservations (outgoing from London to Brussels). Thanks.
"I understand that you can get the 2 for 1 offers if you show your rail ticket(s)."
Not just railway tickets, travelcards bought from a National Rail station also qualify.
"Would this apply to a Britrail pass as well? How about Eurostar reservations (outgoing from London to Brussels)."
No. neither are run by National Rail.
Details of all the 2-for-1 offers are on this website: www.daysoutguide.co.uk
You must have a voucher (best printing them before you leave home) and valid train tickets or travelcards covering the date in question. The travelcards must be purchased at a train - not tube - station. Further details in article top right of this page.
Well Britrail are run by ATOC who are essentially National Rail
But Britrail passes are explicity excluded in the 2 for 1 T&C so the answer is still no
"Well Britrail are run by ATOC who are essentially National Rail"
Oh, I was under the impression they weren't from another thread:
"Britrail appears to be a French-owned American company that makes its money by quoting absurdly specific plans on the basis of the Network Card-discounted fares quoted on the National Rail site".
http://www.britrail.com/about-us
is definitely ATOC - they own the trademark
Mind you they have licenced a Canadian company to do the marketing so that muddies the waters.....