Persicaria campanulatum. I have it, it goes everywhere, 10 times as fast if it gets moist soil. But it has very pretty flowers from anytime now till the frost and it is surface rooting, so it is very easy to pull up. I just contain it in patches by pulling off any bits reaching out. If that hasn't been done on a regular basis it can cover a large area in a very short time!
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In the sticks near Peterborough
Persicaria campanulatum. I have it, it goes everywhere, 10 times as fast if it gets moist soil. But it has very pretty flowers from anytime now till the frost and it is surface rooting, so it is very easy to pull up. I just contain it in patches by pulling off any bits reaching out. If that hasn't been done on a regular basis it can cover a large area in a very short time!
That's definitely the one, Buttercup, nice one!