plant id, please

[LoveSatsumas]

I'm sure it's a weed but want to be sure before I start ripping it out. Hopefully you can see it, amidst the sweetpeas.
TIA

has it got a stem?
could be an ash seedling.
or wisteria

@bluefoxmug
It's got a stem but also very tiny pink flowers, on the stem.
I'll see if I can take a better photo

Better photos

It looks a bit like common vetch. Maybe...

@knittedfairies. Thank you. Just looked common vetch up and that's exactly what it is.
Off to pull it up now

It looks too pink for common vetch (Vicia sativa) which is pinky purple rather than pink, and the leaflets are too broad. Also, the terminal leaflet of a vetch is replaced by a tendril, and on your plant you seem to have a terminal leaflet. So one thing we can be sure of, unless the pictures really aren't doing justice to the colour, and are not showing the leaves well, is that it isn't common vetch.

I don't think it's a UK wild flower, I think it may be something that got mixed into the sweet peas. If it were me, I would leave it, and I'd be scouring European floras to try to identify it.

But you clearly don't like it, whatever it is, so by all means get rid of it.

I'm up late watching noctilucent clouds and reading through the gardening section of Mumsnet so please excuse any atrocious grammar and spelling: I believe it's one of a group of sweet peas (lathyrus), rather than vetch, generally grouped under perennial sweetpeas.
Possibly lathyrus vernus, or spring pea www.gardenersworld.com/plants/lathyrus-vernus or black pea shireplants.co.uk/lathyrus-niger-perennial-sweet-pea/ - apols for the latter being a shop link.