On 11/4/2012 2:25 PM, ARW wrote:

All is now answered and the customer will be happy to pay a little extra for
the mains powered with battery backup interlinked detector. The customer
might still see his arse when he see how much plaster fell from the wall
when I chiseled out for a double socket (ie most of the plaster on the wall
within 6 ft of the socket).

Eeek!