Dear All,
I've just been reading the following post which says that it's no problem to use a 2 way pull cord switch on a 1 way circuit:-
https://www.diynot.com/diy/threads/can-i-use-a-2-way-switch-on-an-1-way-circuit.278152/
I've installed a replacement switch, which was only sold as a 2 way...