That means pay for one and the other gets in free, or effectively both of you get in half-price (if your mates are stingy). The catch is that you technically have to travel by train to render the print-off voucher valid on presentation. Those who live in London know what a nightmare it is travelling into central London, so most of us would opt for jumping on the tube anyway. That's the problem, Oyster cards are not accepted! Its run by National Rail of course, and they wouldn't be making any money out of it if we all took the tube to get there.
But you can be smart: just top up your oyster at a station that has a London Overground line and you can use their ticket machines, which give you a receipt. The key thing is the receipt bares the National Rail symbol and the chances are you should be able to use it to validate your voucher on entry to your chosen attraction. I have only tried this at London Zoo, but usually they just accept the print-off voucher without asking for a National Rail ticket. The one time they did, me and my wife's top-up receipts were accepted without question.
As with many money saving deals, its worth a try. Check the Leisure & Entertainment page for a link to the Days Out Guide website.
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