Ive had 2 encounters with this company, ( not directly ) one was a customer who was quoted 1k for in/out - totally over the top price - needless to say i easily got that, and the other was a very upset lady she had paid £800 and they missed most of the bits shown on the video ( yes everyone can have a bad day ) we soon polished this off to give a satisfactory result.
Ref the video, most of what's shown is to me bad practise, with wfp, and backpacks to deliver chemicals there is very little need to climb over a conservatory like in the video, it's also very slow! And rarely a better end result, the exception to this is if your renewing the mastic/silicone or removing compromised polycarbonate panels.
There are always various levels of service to these things, and there is a market place for this type/cost of clean but it's small and it's going to tie up lots of your time, our standard clean will 95% of the time equal what's done in the video, but takes anything from 45 mins to 1.5 hours.
Most of that video is good promotion rather than good practise
Darran