Any views or advice on this, please:

We have a wireless doorbell: bells (2) plugged into the mains, and the
bellpush fixed to the outside of our porch.

I'm now finally fed up of the bellpush failing spasmodically -- Damp?
Cold? Battery failed? -- any and all of these causes have been
identified, and fixed, over the years.

Whenever it fails (due to cold and/or damp anyway), it usually corrects
itself .... so we never know when the bellpush is going to work, or not.

And so I've resolved to get a mains-wired bell instead (with the
approved transformer).


I'm looking for advice on drilling through the porch (door upright) -
it's UPVC, with a steel frame, of course.

And also any hints (make of doorbell, fitting transformer ... anything?)
would be much appreciated!

Cheers
John