Jim Ford writes
I'm familiar with the usual wild mulleins, with the single spike of
flowers, but never seen one like this before. It's about 2.5 meters tall
and growing 'wild' on a bank where I work.

http://homepage.ntlworld.com/james.ford60/mullein.jpg

Identification anyone, please?

You could try Hoary mullein, V pulverulentum. It's branched and quite
big. According to Fitter, only in E Anglia, though I was at a nature
reserve in Derbys at yesterday and I'm sure the warden claimed that the
large branched mulleins on the steep sides of the valley were hoary
mullein.
--
Kay