On 2007-09-17 22:55:58 +0100, John Rumm said:

jkn wrote:

Thanks John & Andy - that's really useful.

As an aside, I used one of these the other day:

http://www.tlc-direct.co.uk/Products/LB9045.html

And was surprised to find it came complete with a boiled sweet waiting
inside for the lucky installer. I don't think it was an accident
either, since the wrapper bore the makers "ELS" logo and details!

It's worth putting them underground just so that one can play with the
epoxy gunk :-)