Update on payment issues with FTE:
I retried the link provided in the original e-mail this morning and got through. I would assume therefore that the issue have been fixed but if you're still having trouble, they are aware of it and are "currently doing our very best to solve it as soon as possible"
Note that payment will be in euros, (€312 at the time I paid) so if you are able to use an international transfer service you could save yourself a few £s by avoiding the bank's ludicrous exchange rates and charges!