Imported post
You could try
Robin Hood Watersports they are based in Heckmondwike which I think is reasonably close to you.
I did my Dry suit with them last year and it was £95 inclusive, kit hire, site entry, air, blah, blah.
In fact I went up for the full weekend with them while they were teaching OW and AOW. I got four dives in rather than the basic two you need for the course (and for no extra cost, other than my overnight accomadation).
You can contact them via the website or direct to
[email protected] (freelance instructor who runs speciality courses affiliated to Roho).
Not sure what level you are but you could consider doing your AOW in a drysuit. That way you get your AOW and you'd get sufficient experience in a drysuit too. This would be more like £250 though.
Let me know if you need anymore information.