The text on this label has been updated to read the following:
This installation, or part of it, is protected by a device
which automatically switches off the supply if an earth
fault develops. Test six-monthly by pressing the button
marked 'T' or 'Test'. The device should switch off the
supply and should then be switched on to restore the
supply. If the device dose not switch off the supply
when the button is pressed, seek expert advice.