shaun wrote:
....snip...

You're looking for a "power scraper" - they look like an electric jackhammer
with a large flat flexible plate on the end of it. If you think of SDS +
tile removal chisel but on something that stands about 3 or 4 feet tall.

Hired one for a day from our local place - not expensive and made short work
of lifting a very well stuck vinyl floor without damaging the subfloor.

Thanks for the advise.I'd been thinking of using something like hilti
rotary/hammer drill with a wide floor lifter type chisel. I'll check
with our hire shop.

H.