I switched onto a new tarrif with Scottish Power about a month ago and didn't realised I had agreed to a smart meter in the T&Cs.
They just called me to book an 'appointment'.
I don't want one to be installed, so it appears they will revert me onto a SVR tarrif after three months.
So just a warning that this is now becoming the standard way to 'lever' customers ino smart meter installation so watch out.