id say £90 ph is the usual. Where i am Colchester the going rates £15 per small house any windie worth his salt can do 6 p.h. then theres tips
I think most people can line up a good section of domestic work and get a very good rate for a bit here and a bit there.
To do 6 X £15.00 houses an hour every hour is less doable especially when I add in pleasantries, payment slips, moving the van, stopping for a coffee etc. etc.
Having said that I believe £60 an hour over say six hours (excluding a break or two) is readily achievable.
But look at your turnover for the year for your true earnings. And that's before costs.