What is the name of this flower?

Possibly a delphinium or aconitum - if the later it is poisonous

I think it is Aconitum( monkshood) as Moon grower says it is poisonous.

It is indeed an Aconitum and all parts of the plant are poisonous..

But as long as you don't eat it, its worth growing because its such a beautiful blue...

Oh I agree Bamboo

Yes...I have one but it hasn't flowered yet...It doesn't seem to like being overcrowded by the dahlias...lol

Many thanks everyone for so many quick replies. Thanks for the advice re being poisonous, particularly important if there are children around. However we are past that stage and I agree a beautiful colour and worth growing. Must get some for next year

Yes...I have one but it hasn't flowered yet...It doesn't seem to like being overcrowded by the dahlias...lol

Well... would you? lol!

The flowers are amazing and I really enjoy seeing them growing in the wild