The overall finish was quite good - not as good as other window cleaners I've used who climb ladders and get close up (they used a long hose to wash) but it was a good end result.
There was a lot of 'problem is' type friction at the beginning as the cleaner argued that the skylight wasn't a sky light and was a glass roof.
It is a skylight... and is actually really easy to clean as it's within a flat roof and easy to climb onto but we removed it from the quote as he tried to charge me another £25+ to include it. Would have been better for someone to have accurately quoted for the job - particularly as I spent so much time filling out the job form/request.
Price wise it was more than I usually pay.