as mentioned ......Tysers - policies purposely designed for this industry 01206 500 000 -
Equipment cover usually includes losses from unattended vehicles on location/venue (subject to usual protections) and also unexpected breakdown (but not time-expired /normal Wear & Tear.....and also excludes light sources!)
also:
Precision Broking - Live Insurance - 0117 244 5813
Yutree Media & Entertainment - 01638 660651
Others are available.
Good cover doesn't come cheap, as you'd expect......
info offered without prejudice!
Best of luck