Field bindweed before flowering?
No interactions present.
Leaf shape is more akin to Calystegia sp.
BMIG website: www.bmig.org.uk (centipedes, millipedes & woodlice)
BMIG Newsletters ~ www.bmig.org.uk/view/resource/bmig-newsletter
BMIG Bulletins ~ www.bmig.org.uk/view/resource/bmig-bulletin
Some of the leaves look more like C. silvatica, so perhaps it is the hybrid?
I added the Calystegia comment because the likely ID was down as Convulvulus at the time (which I didn't think it was!). Agree should have stuck with genus.
Lat/Lng: 51.8011, -1.4091
OS grid ref: SP408115