Not sure if this is well known but trying to book from the UK is much more expensive than booking on the French website for exactly the same thing. A disgrace if you ask me.
http://moneybarrow.co.uk/index.php/2015/10/12/disneyland-paris-rip-off-uk-customers-pay-25-more-2/
http://moneybarrow.co.uk/index.php/2015/10/12/disneyland-paris-rip-off-uk-customers-pay-25-more-2/