I have used attractiontickets.com in the past and used it again today. If you go through the dibb forums, there is a banner ad on their "tickets" forum with a £10 per ticket discount. I couldn't get the discount box to pop up on my laptop in the checkout page though - maybe popup blockers?
Bummed because I used that link to book instead of going through my brother's (who lives in the UK) TopCashBack account for a 1.06% cashback rebate.
After I booked, I got a note offering a referral bonus of £20
Amazon gift card each - I would have split up my ticket purchases if I had known.
I checked expedia.co.uk since there is a 10% cashback there but their tickets were much more expensive. Disney UK was asking £489 while AttractionTickets.com charged £485 for my specific 14 day Magic ticket.
Also, pounds was cheaper than euros for me today.
I am currently in Canada but used a US credit card (and billing address) to pay. Don't expect to have any issues with using the tickets at the parks.
Huge savings for me as the tickets I was going to buy (7 day base + waterpark) was US$667 whereas these 14 day Magic tickets works out to US$546. We are actually in orlando for 16 days so the freedom of the Magic tickets work out fantastically. 7 day tickets could only be used for the first 2/3 of out vacation which would have been annoying. (miss the 14 day validity they used to offer).