Off the top of my head you have got
Pool House Farm
Brick Kiln Lane
Hunts Green
near Middleton
Tamworth
Staffordshire
B78 2BA
01827 874856
Think its around £6 for the day..
You have also go Kingsbury waterpark which looks a bit cheaper
Fisheries.co.uk - Kingsbury Water Park, Bodymoor Heath, Sutton Coldfield, West Midlands
I'll have a word with my dad he will know of a few more.