Redwood Television or RTV was founded by Chris Evans in 1980 as a facility, providing
Camera Crews and equipment to Broadcasters and Production companies. 
RTV Gadgets is a spin off from this service. 

I originally trained as a Broadcast Television engineer with the BBC and then worked at Granada TV in Manchester 
where I developed many test devices to improve the standards of performance of both cameras and sound in the studios.
RTV Gadgets grew from these skills.
I have an idea for a “gadget” that may be useful, design and build a prototype for myself, people see it in use
and ask "could I make them one".
That was the way with the Dimmers which have been around in various forms for over 10 years now

They have an excellent reputation for reliability.”