Sorry, LB. I'm no expert when it comes to smart meters.
I'd happily have one except that I know that after installing the gas one, they'd test my gas cooker and find that it doesn't meet the safety standards. (I know that two of the burners emit excess carbon monoxide. I simply don't use them and keep a CO alarm to let me know if there's any problem with the others). So they'd refuse to reconnect my gas supply until I bought a new cooker.
Further, the gas fire in my living room hasn't worked since my cat peed into it about a quarter of a century ago. So, even though I don't use it, I'd have to get the gas fire replaced as well in order to satisfy the gas engineers.
So my 'free' smart meter for gas would actually end up costing me a fortune!
[BG keep trying to force a smart meter on me but, for the reasons that I've stated, I've held firm on the issue so far!].
If it might help you at all though, here are the current customer satisfaction ratings for energy suppliers from Citizens' Advice:
https://www.citizensadvice.org.uk/consumer/energy/energy-supply/get-a-better-energy-deal/compare-domestic-energy-suppliers-customer-service1/