tried gleaming, they were nearly £300!!
Got a quote from ALexandra swann, covered for £5m, including damage for property being worked on, and including gutters, fascias, cladding etc. £179. That's better! Excess is £250 though, and if it's for glass being worked on then it shoots up to £500?! mental, hardly seems worth it but I've got a particular job i'd like to hold on to that are requiring it..
Thanks for the recommendations guys..