These ‘weeds’ look to be a common type you see around, but I’ve never seen them this big! The bike in the picture gives some idea of their size. But I reckon they were some eight feet tall. I found them growing on Lower Wharf Street, Ashton-under-Lyne.
Following a bit of Googling, I believe they might be:
Giant hogweed, credit hockadilly.
Anyone know for sure?