Thanks very much for all your help. Very good point about dry mix
pointing. That's something I'll be looking out for but to be honest,
it's all so old that we're having to re-point a lot anyway so if it
does come away it was probably loose in the first place.

I think we'll go for a cheap one and see what happens. It's nice to
know that B&Q will allow us to 'upgrade' if we want!

Thanks again,
Crom