On Saturday, 13 July 2019 17:48:21 UTC+1, Muddymike wrote:
Also I'm struggling to find a simple bell to replace the current chime
that is 12v, most seem to be 8v.

They'll be okay, they're only energised for a fraction of a second.

Burglar alarm sounders run on 12 volts (DC, but AC/DC bells are available) if you really want a 12 volt.

Owain