I think it's Trifolium rubens.

Beat me to it Anget

mine has just started to flower too. one of its common names is Hare's foot clover.

It spreads everywhere and can be a nuisance, although it is very pretty :)

Many thanks for your replies. It seems to keep itself contained in my garden Hywel unlike the Japanese Anenome I planted years ago without realising the nuisance that has caused me. Just when I think it’s gone from a certain area in border- up pops a leaf !!

Now I have no trouble with Japanese Anemone, isn't that strange :D

Would be on my list of don't plant in garden no matter how beautiful it looks.