In reply to dan lane:
I once got my Mum to write me a note saying I have permission to climb for a wall in Sheffield, they didn't seem to mind too much. Worth a go if you don't find the form.
In reply to mark20: Actually Mark that is not quite true. I phoned your local wall and asked the manager there a few questions. Without his answers you would not have got in the Works. Your your mum's letter had no bearing on my decision.