Found by Roger and Sue, the Wardens at withymead Nature reserve. 1st Record for Oxfordshire? or possibly the 2nd? as there is a report of one found in Nyatt's field thats in between Barton field and orchard lake at Radley lakes in 2015. Thanks to both of them for the invite to catch up with it.
Addendum:- Wasp spider found by Judy webb and photographed by Ian smith in Marcham near Abingdon in August 2016 so Rogers spider is probably the 3rd Record for Oxfordshire?!