Its easier to tell from the front pics, Id say each property is about 8 metres across, that makes two runs of 160 metres.
Just emptying gutters I charge £3.00 a metre, that works out at £480.00
Someone suggested difficulties due to access, I dont think I seen a row of 10 houses with such easy rear access, theres some numptys here.
As Stan also said, use a stand-off, use a rojak.
It looks like about 5 hours work to me.
480/5 = £96.00 per hour.
