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You need move this observation to the plants group.
The cultivar name is Cardamine pratensis 'Flora Plena'. (source, European Garden Flora vol 4)
Just me being picky, sorry.
"flora pleno" is, of course, a rather loose and usually unofficial label randomly attached by gardeners to double flowers, but this is a case when the actual cultivar name is similar. Current rules prohibit new, latinised cultivar names, so this is one of some age.
Thanks for the correction Alan, I must admit I came across this plant first in a garden context, hence the spelling. Thinking I knew the name, rather lazily I didn't check it before posting an identification, lesson, hopefully, learnt for next time.
Lat/Lng: 50.4, -3.8
OS grid ref: SX7466