Hi Brian,
Thanks for your reply, I did note the above but as my question wasn’t regarding cabling systems or indeed anything in a fire escape route, it seems that cable ties may be appropriate if they can be shown to be strong enough.
It is an interesting point though regarding cabling systems. In my previous life many of the UK theatres I visited had cables either PVC taped or cable tied to scaff bars fitted above the stage entrance doors, which are almost always fire exits, I guess metal hooks is the obvious choice to make things compliant but also quick to rig/derig.