Thanks Alan,
Just to let you know that he called me early this morning and wanted me to go round and give it my best shot. I'd already justified that I didn't think it was going to come out but he waned me to try!
I'm really into using splitter no.2 at the moment on upholstery so thought I'd try that first. And before my very eyes it came out, took 3 or 4 goes but then was completely gone

.
I'm amazed sometimes what splitters will remove without the need for grabbing the spotter kit from the van.
He was over the moon and so was I.
Saved him £2000 for a new suite and the tight old got didn't even give me a drink

Never mind eh, job satisfaction and all that!
Kind regards,
Jason.