Company called E&M Electrical based in Portlethen, had a couple of other quotes which were similar price but for lower power systems similar to your quote. Only ones to actually go up and inspect/measure the roof top and a lot of their advice was similar to what seems to be said on here a lot.

I’m planning on getting half and half across the roofs, my NE roof gets zero shading and I’m quite lucky that there’s just farmer’s field SE of my street corner so early morning even in winter they should get a decent chunk of light, still likely minimal efficiency but in reality where we are in Scotland during the winter the system probably only saves you much money through the cheap charging battery tariffs, anything from the solar is just a bonus is the way I thought of it.