Found it thanks, I was focussing my attention under the car. Haven't got a Haynes, didn't know they made one for the Bis, just have a fuzzy black and white PDF book.
You have to remove the plastic cover as the rear screw in it goes through the metal cover plate, plus one seat belt anchor to make life easier.
Looks to me that it would be simpler to remove the handbrake lever rather than fiddle about with the pulley in situ. Mine needs a lick of paint anyway.
Bit worrying that the handbrake/emergency brake cable appears to be held in place by adjacent perished grommets but will see when I get around to completing the job.
It is a hefty cable so I am surprised it has stretched.
Thanks for the help