I think this is the cuckoo bee Nomada lathburiana which inhabits nests of mining bees.
No interactions present.
With my level of knowledge I am confident that this is a Nomada but I would be grateful if anyone could explain the difference between the two suggested species! Ta
N. lathburiana females have some reddish brown markings on T1. The most striking feature of the females is the very obvious short orange hairs all over the thorax, which, once seen, are not forgotten.
Check out http://www.bwars.com/nomada_lathburiana.htm
N. goodeniana is a bi-coloured species with continuous yellow bands across the tergites. It also has yellow tegulae and yellow (not orange-haired) scutellar spots.
Males are more tricky, but lathburiana males have obviously green eyes
As ever, thanks for your comments.
Lat/Lng: 51.43372, -2.76236
OS grid ref: ST471707