The weather here (Southampton) differed from the forecast today, at
least before around 2pm. The forecast said, and the weather charts
implied, that there would be quite a sunny morning with cloud
increasing about now. This has happened this afternoon (it was quite
sunny between 3-4.30pm particularly, now the cloud is coming across)
but what was not forecast was a fairly general and extensive area of
cloud (low-based and extensive cumulus below Ac sheets and some
showery rain, heavy at times) between around 8-11am in particular.

The weather charts on the Met Office site showed nothing - guess this
was some kind of wave/trough which formed unexpectedly. Did any other
parts of southern England see this?

Nick