Anyone know of any decent local pools for hire in Norfolk?

there are a few criteria though, as I am looking to hire them out to put on water-based classes eg bootcamp, martial arts etc.

* Pool needs to be no deeper than 1.6m, but ideally be around 1.25m.
* No fibreglass shelled sand-based pools - they won't take the impact!
* Ideally big enough for 15-25 people to take part in the class!
* Changing facilities and showers en-bloc attached to the pool are essential

If anyone knows of anywhere they think would be suitable, let me know please!