Interesting options to connect to free wi-fi at Heathrow's terminal 2. 
Option one is through Twitter, and here's what you're asked to accept:

Needless to say, I went to check option two, and it's a signup form asking for your title, name, email address, and flight number, but absolutely no validation on any field...
I would have accepted to make a small contribution to your mailing list in exchange of free wi-fi, Heathrow.
You'd have sent me a newsletter, a chance to hook me in or make me leave depending on how interesting or funny you are.
But between giving up everything or nothing at all it wasn't a very hard choice.