I, too, feel a strange call to service with this one and invite PMs (include an e-mail address...can be a "junk" e-mail as long as you can receive) and will gladly get a code sent out to you
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The e-mail with the code also has the handy-dandy link as well as the full scoop on the T&Cs.
The great thing about this deal and the part that might not last is there's no minimum purchase on the 20-pound code (which works out to about US $30.40). So if you find a $30.40 hotel for one night you can apply the voucher and pay only about 1 to 1.5 pounds booking fee. U.S. addresses and U.S. credit cards work fine; you don't have to be in the UK.
It also stacks with "second night free" offers, so you can get TWO nights at a place like the Golden Gate in Las Vegas for just the 1-pound booking fee. Such a deal.
In places like LAS with a number of choices under 20 pounds, though, I noticed that if you have a multi-night booking it'll only deduct the cost of one night, maximum. So if the room cost is 13 pounds and you book 2 nights, you save only 13 pounds rather than 20. So it's better to max out the value and aim for a 20-pound room or higher. Most cities have only those.
Would expect you could get options close to $0 in LAS, RNO, maybe MCO and overseas in places like Thailand. Also works well for 1-night bookings just about anywhere. The validity period through the end of the year is also a big plus.
All of which is great reason to PM ME for your very own!
Ride this horse while u can.