Most of the thunderstorms I've seen in the UK are electrically weak. Only a few examples I've seen stand out as having frequent lightning, such as September 2016 and July 2015. I haven't seen a proper thunderstorm since September 2016.
The UK is a very poor climate for thunder - too much maritime influence and cool temperatures in summer. Just looking at CAPE/LI charts demonstrates that the conditions are rarely present, whereas over the continent with its strong surface heating values are often high most of the summer, hence their frequent and often severe thunderstorms.