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The three lobed leaves with coarse teeth reminds me of Trifid Bur-marigold, but there is no indication of size and it's not a plant I have seen for many years. Any thoughts on that?
My Flickr photos...
There abouts, anyway. I considered figwort, but it looked wrong. I ended up baffled!
I interpreted the photographs as showing square stalks. If that's the case then it won't be Bidens.
If that's a misinterpretation it isn't Scrophularia, and I don't know what it is.
...and one of the others at full size. Perhaps these might help.
The appearance of a figwort goes away with the larger images. That leaves me baffled as well.
I do see the occasional Bidens, mostly along canal banks, but I'm not recognising this as that. (Perhaps it's just the immaturity that's fooling me.)
It looks as though the top of the plant is suffering from some kind of gall. If it is not square-stalked, then Bidens tripartita is the most likely. Very tricky!
...that it's not just me who was puzzled. I've looked at a few images of Trifid Bur-marigold now and that does indeed look the most likely. Thanks, all.
Lat/Lng: 52.0798, -0.2919
OS grid ref: TL171437