In reply to Bingers:
Was with Good Energy, now with OVO. Both a massive improvement over the big six, in that you can ring them up - or email them - and talk to helpful and effective cust services.
e) is hard to reconcile with c), though IIRC both providers have a choice between a cheaper 'light' green and more expensive 'dark' green tariff. Frankly I think that, for the sake of a few extra quid a month, going 100% renewable isn't that much of an expense, but that's just me.
All suppliers will be rolling out smart metering over the next few years. OVO seem slightly ahead of most on this.
There are 'recommend a friend' bonuses available, so if you fancy OVO do feel free to ask me for a recommendation, and we'd get £25 each