In uk.rec.gardening Spider wrote:

IF you do consider an electrical tool, please use a circuit-breaker from the
start - don't wait until you've had an accident.

You mean an RCD, a "circuit-breaker" doesn't necessarily mean an RCD
though an RCD is one sort of circuit breaker.

If your house is modern or has been fairly recently rewired all sockets
which 'might be used for appliances outdoors' must have RCD protection
anyway, this will be in the consumer unit (Fuse box). Thus additional
protection is unnecessary and can even be a bit dangerous as there
will be no discrimination between the RCDs.

--
Chris Green