Thanks for all those suggestions folks, some I haven't looked at there so I'm off to investigate them!
A lot of them I have though, which are just gorgeous and have had to be discounted for one reason or another - East Riddlesden, the hall isn't big enough for our ceremony (by the looks of the website it only seats 35, unless I've mis-read this), Harewood - a friend is having his there in October, Bolton Abbey - ££££££, although I'd LOVE the Cavendish Pavillion and haven't ruled this out if I can find somewhere for the ceremony, Nostell Priory unbelievably not big enough, and Hazlewood Castle a bit pricey.
I would love Victoria Hall. An old friend of mine is the manager there and it would just be completely perfect for us (my engagement ring came from Saltaire too!). The biggest problem is though that my best friend got married there last year and I think she wouldn't be amused if we went for it.
I'm starting to think we're impossible to please 