What is this
White bryony I think, GG.
Thanks I will let the person know as from someone on the allotment
hard to see from the pics but white bryony looks favourite.
Be careful when you dig it out to excavate around the root which will be like a very large parsnip (think it is also known as Devil's Turnip). It can grow back from a snippet left behind and it will snap so find the source of the stem, move the soil away and you'll soon find the root top. dig down with a trowel to get the whole root out if you can.
This one didn't come back - dug out in 2014!