Infra red might help a little, but are most effective when you are in front of them (line of site).
I can't see how a smart meter on it's own would make any difference at all, other than provide easier access to the numbers, but timers on individual heaters could help (at the expense of more temperature fluctuation, and hence cooler rooms when they are off
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The benefits of smart meters will come the day when utilities can use them to switch off YOUR heating/fridges etc when THEY want to, and therefore offer lower electricity costs, since doing this en-masse will reduce the need for spinning reserve and energy storage.
By far the biggest benefit, and this applies to the majority of our appallingly inefficient UK housing stock, is to retro-fit insulation improvements. - External wall insulation and render if possible.
Internal insulation improvements are possible otherwise, I've actually done the majority of my own house this way now, and have helped with individual rooms at friend's house.
The effect of adding 50..70mm PIR (Celotex..Kingspan) internally (even to already filled cavity walls) is dramatic, and it's instantly obvious on the whole feel and utility of the space, as well as a huge reduction in energy bills. It's a real lot of work though, for example, minimum of probably 8 days to do a single bedroom since it means 100% stripping it all out, including cills and window reveals extending electrics and plumbing, and taking minute care with the integrity of new vapour barriers before the new plasterboard goes in. They would also find it hard to find someone to do it, and I'm not volunteering.