Thought I would give this a plug as I did this the weekend!
Place called Go Ape, this was one was near Cannock (Bham) but there are a number of them I believe scattered over the UK.
What a brilliant few hours out! I was quite skeptical at first but wow I really enjoyed it, it was a treat from the missis! I thought it was quite expensive (£30 quid each but we had 20% off) but its totally worth it!
Your up probably 60ft up at the highest