Yellow and black wasp on a gorse flower by Keston Ponds.
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Thanks, it must be one of these. I am using Collin's so-called Complete Guide to British Insects for most insects. It shows only one Nomada species, from the top so that you can't see the abdomen or the sides of the thorax. But there are plenty on line once you know the genus to look for.
Yes, lots of good resources online. Some Nomadas are difficult to differentiate from photographs though, particularly males. The time of year you see them is important too, as some are associated with particular species of Andrena bee which they parasitise (as cleptoparasites).
I went back two days later and saw many Andrena flavipes a few feet away from the bush this bee was resting on, so as that's the species Nomada fucata parasitises, that ID makes complete sense.
Lat/Lng: 51.359111, 0.036137
OS grid ref: TQ418641