Idly looking through the coming weeks weather models. On GFS Thursday stands out as a day with potential for some severe thunderstorms in the south and south east. It shows a low pressure area bringing some very warm and moist air up from the south, with a lot of energy available to creat some cracking weather.
Caveats: ECMWF and UKMO aren't quite so gung ho I don't think, but I can see more detail with the GFS model, so it's easier to interpret. The met office website shows nothing of the sort. As I'm just an amateur, please use the met office website before making/cancelling plans.