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any reason it's not Nomada goodeniana? -
entire yellow bands on the abdomen, yellow scutellar tubercles and yellow tegulae see: http://www.ispot.org.uk/node/255677
latest pics and diptera videos
I am not very familiar with N. good., but my experience with Nomada generally is that they are best checked in the hand. Not an easy genus, with lots of similar species.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
To clarify what I wrote above ('A bee that steals the pollen store of Andrena mining bees'), the Nomada takes over a pollen-stocked nest and lays its egg there. Don't imagine a Nomada flying off with a mass of pollen in a bag marked 'swag'. They do not collect their own pollen, which explains their lack of hairs, giving a wasp-like appearance.
I assumed it was a wasp. Amazing antennae.
Lat/Lng: 51.3874, -0.154
OS grid ref: TQ285669