Andrew Gabriel wrote:

Bathroom floor is floorboards, with vinyl stuck down with some
black glue. Want to take up the vinyl. Glue looks a bit like
bitumen but it doesn't seem to soften with moderate heat.
Tried flat bladed shovel, but that won't cut through the glue
either. Any suggestions on getting it up?

A grown-up scraper?
http://www.screwfix.com/app/sfd/cat/pro.jsp?id=21102&ts=14398

Does tend to snag in the surface fibres of the floorboards though, if
they aren't pretty smooth.

David