In reply to
For climbing wall information join the Association of British Climbing Walls: https://www.abcwalls.co.uk/about/become-a-member/
This will give you access to the documents described here: https://www.abcwalls.co.uk/about/overview/
Another good place to look is: https://www.thebmc.co.uk/information-for-wall-managers but the ABC is the place to go for access up to date industry practise, information and advice. If you are looking in Scotland Mountaineering Scotland can offer a similar service (drop me a PM and I'll put you in touch if up here).
As Luca says an external Technical Expert may be useful. This person can provide input on specific issues outside of your own experience and staff training where there is no relevant NGB held or available. Do make sure you get access to one with appropriate experience of your type of climbing setup, including High Ropes which is slightly different to just a climbing wall.