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It's not willow herb, I've been weeding that out so I know what that looks like. This is a shrub. 2 year (or more) wood visible in the centre of image, the rest is new shoots.
I was about to point out that it was a woody plant, but you beat me to it. I'm wondering if it's some sort of Fuchsia. (The foliage of Fuchsia paniculata looks similar.)
How about a Vinca ?
I guess I'll have to add another photo or two when she has flowers :) Thanks for the help, fuscia and vinca both look plausible
Lat/Lng: 51.8, -2.2
OS grid ref: SO8819