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It is caused by movement of electrons in the cloud, yes - creating a difference in charge, either between parts of the cloud itself or between the cloud and the ground.

Not sure - seems a good correlation - there are a few active zones, but most of the rain is not thundery.

Possibly - at the moment there seems to be too much cloud over southern England to generate much locally.

If they follow the trend of the previous couple of bands that tried to corss the channel then they will decay somewhat - but with the extra heat as the day progresses and the enhanced instability in the more organised band, you never know. Plus of course, away from the coastal strip they will...

Yep - there's a decayed showery clump coming ashore now- you might get some rain, but the main event is a couple of hours behind. www.raintoday.co.uk

Yep - some potent storms brewing over northern France right now, heading our way