That is becasue it's not a wasp, it's a solitary bee, Nomada. I have seen a lot of these this year, and was advised by an expert that they are Nomada ruficornis. Yours look very similar although I'm not sufficiently expert to say if this is definitely the species.
Thanks. I must apologise I put up a similar Bee only a few weeks ago. I think a better photo and having been on holiday put me off. So thanks again; I should now Know the difference between a Bee and a wasp having done some homework. John