In reply to Alice:
I don't think you will find anywhere that will hire you trad climbing gear - I've looked in to it in the past.
Others may correct me if I'm wrong, but there are no companies in the UK that will provide more than the minimum 'climbing wall kit' hire - ie shoes, harness & helmet - Adventure Peaks, OutdoorHire.co.uk etc
I'm 99% sure that ropes, cams, nuts and slings etc are not hired out as they could potentially have taken high factor falls in the past and there are two many risk variables. I wouldn't really want to risk my life with kit that I don't know the history on. The hire companies also aren't willing to take the liability risk. They would need to have every piece checked and signed off as safe after each hire.
For Bouldering, there isn't any reason why you couldn't rent a mat.......but there isn't anywhere in Scotland to rent them.
Sorry, we're a bit rubbish up here!