I'm a little further north than you, north of the Tay but not so far as Aberdeen. My solar panels down south here are also facing more-or-less southwest and I'm seeing similar figures.

Up north of course I've got the space to put my ground mounts wherever the hell I like, and sufficient power from them to run the welder so they can be any shape I like :-D But the weather in the wet and windy west isn't quite so conducive to solar.