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Galium again (see the whorled leaves). It looks as if the seeds have germinated while still on the plant.
Is Dasineura aparines possible
There are photographs online of the gall produced by Dasineura aparines (a gall midge). They don't seem to match. On the other hand the inflorescence/infructescence does look rather swollen.
A gall expert would appear to be needed.
Galium. It looks like a gall, but one pic appears to show a frothy drip, so i wonder if it may be a Spittle Bug instar at work.
I think you are right Brock - looks like spittlebug on galium to me.
It certainly looks like Galium.
Is the white stuff solid, or frothy? It looks like what we used to call cuckoo-spit, but Stewart's comments indicate that it's a solid mass.
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... it might be cuckoo spit. I don't think it looks like cuckoo spit, but that may be an artefact of the photographs which are less than sharp. The gross appearance of the node does seem quite compatible with cuckoo spit.
Looks like Cuckoo Spit to me, you can see the bubbles.
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..but what is the plant, then?!
Galium aparine? The stems looks bristly enough, as do the leaves... or it could be G. uliginosum, I suppose: same bristles on stem and leaf, I can't determine relative size from photos.
which I would have recognised. Cauliflower-like in appearance, slightly softer in texture. I thought it to be vegetable in nature. Sorry about the quality of the image.
Lat/Lng: 52.311819, 0.28884
OS grid ref: TL561706