Can someone tell me what is this lovely flower is and can the leave use for cooking?

It looks a bit like choisya and no I don't think it is edible. see if anyone else suggests a different id.

Agree,Choisya ternata, and no, there are no known edible uses for this plant. I can't imagine wanting to use the leaves for cooking anyway, they absolutely reek if you bruise them, well I think they do, I used to dread having to drive the cuttings off to the tip and being trapped inside the car with that horrible smell...

Lime leaves are used in Thai and Vietnamese cooking, but Choisya leaves don't smell anything like lime, by all accounts! :)

Thanks everyone, sorry Bamboo if you think it smell horrible, maybe I have funny sense of smell. thanks for you comments

The flowers smell fine, but I can't stand the leaves - however, I'm aware that other people feel neutral about the smell, or positively like it, so it just proves we're all different!