I've got a job to price up Where I have to fit 10 port a showers ( electric ) , supply and fit a unvented cylinder 150lt , 7 basins , alter a water main , it's only in use for 10 weeks,, then I've got to rip it all out again,,
As it's in London, why not get one of the local guys on the forum to help you? I'm sure someone with not a lot of work on at the moment would be very grateful for the work.
I done a temporary 6 toilet portacabin outside the swimming pool for the 86 Commonwealth games in Edinburgh. Drainage was put into a very large storage tank. The tank was full after about 5hours!!
The council had to put on extra vehicles to keep it empty.