To bump this we went with a Nest and its been great so far (sparky has a mate who is a Gas Safe and they sorted it between them).
Now getting constant emails from suppliers about going over to smart meters, apart from not having to read the bloody thing is there any benefit or cons, an internet search seems to lead to lots of elderly men with tin foil hats being terrified of them?
I keep getting stuff on having a smart meter fitted.... my take is that I already keep my usage to a minimum, by the simple process of, for example, turning on the heat when it is cold, turning on the lights, in the room I'm in, when it is dark etc.
So a case of if it's not broken...