socket spanner

This is like employing someone to fix your car on the basis of whether they have a particular brand of socket spanners.

The only types of spanner you are not likely to need in plumbing are ring spanners and socket spanners.

Wrench (US) Spanner or possibly socket spanner.

Attach a ring spanner to the nut and a socket spanner to the bolt, and remove the nut.

A cordless electric drill with the appropriate socket spanner and a ladder are useful for this but make sure that the power is completely disconnected as it could come on at any time and cause a nasty accident.