Mr Harry wrote:
i have a great problem with rawlplugs not "biting" in my very crumbly
cinder-block walls.

i have come across something called wetnfix and wondered do these work?
(www.wetnfix.co.uk)

if anyone has used them i'd appreciate your feedback. i'm a bit loathed
to spend money on something that doesn't improve the situation.

They're not bad - I've used them once or twice. I keep then in my
rawlplug box for use in situations where I reckoned a rawlplug would
work OK, but then find it hasn't! Does depend on how crappy your walls
are though - if they're really bad, these things won't work miracles,
and you'd be better off with a more rigourous method like a resin-based
system.

But anbyway, they only cost a quid or so from B&Q or Wickes: hardly
going to break the bank if they don't grip well enough!!

David