I think the chances tonight will be different to the storms that formed yesterday evening, different conditions so around 11pm-2am heavy rain drifting up from SW England, with odd rumble IMO.
Tomorrow could be good though
Yes the clouds in South Wales at the moment look really interesting, a disturbance out to sea on the SW approaches is giving a lot of lightning returns at present.
Next few hours will be interesting to see how things develop.
I think SW England S.Wales could see some isolated activity towards midnight but this will cool down and end up as heavy/thundery rain as it moves North.
Sunshine starting to appear, and cloud breaks here in Shropshire.
Temperature differences are huge at this time of year - great environment for activity.