Agent Orange!
Looks like ground elder to me and it's an absolute
The RHS* is my go-to for plant info so...
https://www.rhs.org.uk/weeds/ground-elder
I like their suggestion that it's not so evil so, in future, I'll leave it and pat myself on the back because it's good for wildlife.
*If you're a member they'll respond to individual queries about stuff and we've used that facility a few times. (Membership makes sense for us 'cos their main place at Wisley is in easy reach).