I just had a look at the website to see if we could work a stop here on the way back from Scotland next month and maybe stay in a hotell nearby - definitely seems to be more of a young family event though with mainly only smaller rides being open.
Looks like Duel isn't included on that map either interestingly.
It would be £60 for us to go to a Christmas market + lights trail so it's a no from us this time, but a lovely idea to hopefully expand on in the future, especially if they can add a couple more indoor attractions at some point.