Some of the industry organisations, camera rental houses and research links I recommend
The Guild of British Camera Technicians
Public Liability supplier & Rates Guide
DSLR to Alexa camera hire
A good resource for manuals
especially the Australian site.
Great resource especially the digital site.
Sony.biz has loads of software and manuals.
Camera and Studio hire in Wimbledon.
Camera Hire in Park Royal.
An events company I regularly work through.
Pentafinder on your phone.
Loads of manuals and data.
Data calculator and handy hints.