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Solitary wasps are hard! But there is a good book in the Naturalists Handbooks series which can get you to a genus if not species: Solitary Wasps by Yeo & Corbet. Also suggests student projects.
Jamie from Briantspuddle
Both times the wasp was on the same picnic table where she obviously likes to eat her lunch! http://www.ispot.org.uk/node/297146?nav=users_observations
Lat/Lng: 51.3, -2.7
OS grid ref: ST5662