Bowser
TS Member
It might have changed since though.
There's a PDF on the "Easy Pass" which makes it sound like it's the same system as AT (card with time-outs applied):
Don't suppose you'd know if it's possible/easy to get a taxi from the park? Obviously that's fine at the Brussels end (and i know they have Uber too) but with no hotels etc wondering if the return might be difficult.
Noticed the park has very limited opening dates too, generally only weekends and holidays which means can't take as much advantage of the UK half terms sadly.