Bramble. Possibly suckering through from the neighbour, or a bird might have perched on the fence and dropped a seed complete with fertiliser. Most people regard it as a weed.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
A weed is a plant...just in the wrong place. Make sure you remove as much of the root as you can...those buggers keep coming back and spreading when you're not looking 😉
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