Thanks. This was driven by me tackling another area that my solar comparison tool [1] had identified as being lightly mapped for solar installations in OSM, but where the Feed in Tariff data from a while back has quite a few solar installations recorded. It looks like an adjacent area, Norwich 012C, has also been picked up in the list, but I've not taken a look at that yet.

[1] https://osm.gregorywilliams.me.uk/solar/