OK, here's the line we've taken,
#1 Apologise for the situation - make it seem like it's our fault.
#2 Tell them how it's come about - massive free solar, mad rush by for social housing to install etc
#3 Explain that we need to do things differently to make it right for them - we are doing this so that we can put them first, and also apologise that things might happen out of sequence.
#4 Ship all materials (panels, mountings and inverters) direct to them so that even if it sits with them for a week, at least they know where thier money has gone.
#5 Talk to them regularly and let them know what will happen next and when
#5 b - we are using a first fit / second fit approach on some of the electrics where it's complicated, and also explain that scaffolding may be up for two weeks becasue of vagaries of weather etc.
So far, they are all delighted that we've called them and explained rather than left them - it has allayed their fears and worries, and they know something is happening. And wether it's 2.5kWp or 50kWp, everyone has thanked us for it.
Hope that helps
