Hi, Nigel

Interesting point about not responding immediately, though you posted just before I did so I hadn't read your post.

What does everyone think is an appropriate time-lag ?

As we seem to be getting an excellent supply of conundrums it strike me as necessary at the time.

Ok, calculators ready ? Though you've probably all heard this one before....

I've dug a hole 3feet+2inches long X 4feet+5inches wide X 2foot deep. How much soil is there in the hole ? NB for the non-imperialists : one foot=12inches

Last guest - too true.