My advice would be to try and contact someone from a local camera club who holds a distinction with the RPS. You could show them your work and method of presentation and ask for their advice. To be honest I think a panel of 8x10 RC prints mounted for the first time would have the odds stacked against it, unless the work is extraordinary original. I believe that the RPS run workshops on preparing panels and perhaps this might be another option for you to try. Good luck with your panel in any case.
What part of Yorkshire do you live in? I am in Nth Yorks and could possibly help as I used to give talks on print mounting to various clubs. Send me a Private Message if interested.