I've come across these hosepipe guides, which look like just what I need
in the garden as I regularly have to negotiate the hosepipe around two
90-deg corners (which are tyrolean-finished which generates more
friction and makes them all the more potentially damaging to a hose)

http://cgi.ebay.co.uk/HOSE-PIPE-GUIDE-WALL-MOUNTED-EASY-TO-INSTALL-NEW_W0QQcmdZViewItemQQ_trkparmsZ66Q3a2Q7c65Q3a7Q7c 39Q3a1Q7c240Q3a1318Q7c301Q3a1Q7c293Q3a1Q7c294Q3a50 QQ_trksidZp3286Q2ec0Q2em14QQhashZitem35a14d4750QQi temZ230339462992QQptZUKQ5fHomeQ5fGardenQ5fGardenEq uipmentQ5fHandToolsQ5fSMQQsalenotsupported
(ebay item 230339462992)

However, the problem is that these things are intended to be screwed
permanently to the brickwork, and where I'd need to site them, they'd be
in the way and it's an absolute dead-certainty that they would be
rapidly snapped off by a passing mower/child/whatever.

What's needed, therefore, is some form of quick-release, demountable
version of this. Considering that my Hozelock wall-mounted hose reel is
exactly that - it has a 'lift-out', wedge-shaped, interference-fitting
bracket - I'm surprised they don't follow suit with these guides.
Anyway, I've been trying to work out a simple way of adapting one of the
existing ones myself, but coming up blank. Anyone got any bright ideas?

It would need to be something that's easily demountable by hand, would
not leave a markedly protruding fitting on the wall when demounted, and
would not involve me in lots of metalwork (other than a drill, hacksaw
and file I just don't have the kit!)

Thanks
David