There is only one benifit to smart meters
The only benefit that I have been able to identify for smart meters is the remote application of variable tariffs. Instead of just a flat rate, or the current 'night rate' (which requires the fitting of a separate meter) suppliers can apply actual hourly rated or worse (better?) variably rated tariffs. If anyone here is old enough to remember the pre-mobile phone era and paper phone bills, then they may remember the massive change caused to teenagers lives by the introduction of itemized phone bills. I suspect the electricity consumer market may be in for a similar awakening.