In article , Graham wrote:

Carry on unscrewing it and take it to the nearest facility that deals with
hazardous waste.

This is unnecessary. However you should (a) open the window and (b)
not use a vacuum cleaner to suck up the remains, as this will disperse
the mercury throughout the air.

Ideally unbroken bulbs should be recycled.

Here is some (American) advice on the subject:

http://www.energystar.gov/ia/partner...et_Mercury.pdf

-- Richard
--
"Consideration shall be given to the need for as many as 32 characters
in some alphabets" - X3.4, 1963.