Somerset,
United Kingdom 
This one really has me puzzled. Several around about 30 cm across, protrate habit flowers rather like ceanothus.
29 Jun, 2016
Answers
Bugle. Ajuga repens. Quite a pretty weed but will spread.
30 Jun, 2016
I think the others were right with Selfheal. The flowers are bigger on Ajuga, the plants are a bit similar.
30 Jun, 2016
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Best remove it before it spreads.
29 Jun, 2016