Well jasonl it's a little more complicated than a simple rotary scrubber like you have, I could make one out of an old dustbin lid and an old washing machine motor and an old pole for the handle.
I have got a TM too ! Its not complex or that great either , yes it sprays hot water ,and sucks floods up well , but what a faff about !
Any decent fitter can fix them cheaper than the dealers , as for Prochem , I am still waiting for a call back despite calling 3 times , in the end I got a local pressure washer guy to sort a pressure regulator , he had them in stock , 40 quid , fitted free in 30 mins.
Also, my rotary was £700 quid new , and apart from pat testing and one new cable , has never had a penny spent on it.