In article .com,
writes:
Yes go for it, and if the floor is a bit springy then put in a
stiffener over the opening. Weak floors don't tend to suddenly
collapse.

http://news.bbc.co.uk/1/hi/england/s...es/4869656.stm
http://news.bbc.co.uk/1/hi/england/w...ds/4848280.stm
http://news.bbc.co.uk/1/hi/england/m...er/4735984.stm

The last one happened during a Health and Safety meeting ;-)

--
Andrew Gabriel