So here comes the silly question if you nice folks can help me please. In the Q and A section on the site it says it man be wired into a mains plug. I've done that but there is nowhere to connect the earth wire to on the transformer from the power cable.
If you are going to "tie-up" a socket-outlet for the exclusive use of a Doorbell, in my opinion a better choice would be to use a Plug-In "Wireless" Doorbell - such as https://www.screwfix.com/p/byron-dby-22322uk-plug-in-wireless-doorbell-white-grey/159kj
It is cheaper and no wiring is required. Although this claims "No Batteries Required", the Bell-Push does contain a Lithium CR2032 battery, which will need replacement at some distant time in the future (10 years ?)- which might cost you £1.50
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