Two nests, both built over the last few months, either side of a window (~1.5m apart).
Interesting behaviour - some wasps on the nest appeared to be fighting (wrestling, abdomen flexing, shaking wings). I also haven't seen the swarming behaviour here previously.
Possibly a different colony or species here to the usual - I remember them being more coppery brown. Unfortunately I can't find a good photo of the nest previously to compare. There is a third nest elsewhere on the house that is business as usual, built around the same time, but I'm not sure enough on my wasp ID to say they weren't always different species.