Heracleum sphondylium, hogweed.

Same genus as the giant hogweed and capable of causing skin burns but it does not, usually, produce enough of the furocoumarins to be a problem.

Called Hogweed as the young stems were collected to be fed to pigs.

thank you both, thought id seen it before but that name escaped me!

That's interesting, Owdboggy. I often wonder how some plants got their strange names. 'Lady's Bedstraw' is pretty obvious but others are just peculiar. :o)