I have been asked to install a small garden water feature that needs an
electrical supply to run a small pump. The thing comes complete with
integral pump and 10m of cable attached. It is to be fitted within 1m
of the house and there is already a power point just inside the adjacent
wall. This is a new house with RCD protection built in.

Is there anything wrong with passing the cable through the wall, putting
a plug on it and plugging it in when required?

TIA

Steve