Hi Andrew, I'm doing the same as you. Waiting for Rex in a couple of weeks but in South Wales so slightly different challenge but same sort of issues I expect.
I am planning on commuting and no charger at work and not a great deal of local infrastructure near me either so needed a home charger unit. Went for 32amp tethered Rolec unit internally in garage. Used
http://www.chargedev.co.uk and they were really helpful and efficient.
I've been looking at the Apps, chargers and subscription services too and it seems to depend on your use of the car and what infrastructure is useful.
Plugshare seem to offer a decent App for finding charge points and you can filter out different types of chargers.
ZapMap do the same. Each of the charging infrastructure companies offer maps too but that's a bit of a faff, you just want one that has it all really.
In terms of charging infrastructure, I started by looking at
Charge your Car (CYC),
Ecotricity and
Chargemaster who run the Polar Network. What you find useful you will have to judge so take a look at them before signing up. Here's my take on things!
CYC - no local infrastructure to me as mainly based in England but Bristol is a big site so may have some use. Paying £20 a year for a RFID card didn't initially sound attractive as I simply don't travel to those places enough to warrant even that. Still thinking about this one though.
Ecotricity - if you're changing power supplier, you get discount off your utility bill and probable free access (fair usage clause!) to the network although their fee structure is changing (e.g. just announced free charging will end for all). The advantage for me is they are on motorway services and trunk roads so could be really useful for longer trips and I can live with the £6 per 30 min charge for the number of times I would use it. Have downloaded the App and waiting to sign up once the car arrives.
Chargemaster - £7.85 a month (free for 6 months currently) with a variety of free and chargeable sites (tend to charge marginal cost of electricity where they do charge). In my area these tend to be in city centre car parks etc so good for days out shopping but at £7.85 per month, I'd have to do a lot of shopping to get any benefit. At free chargers I would have to pull 87kwh per month to recover the monthly subscription. At 7kwh that's 12 hours parked up per month. That's 3 hours per week i.e. a relatively long shopping trip every weekend - and importantly starting with a fairly flat battery of course or you won't pull the kWh anyway. I just don't do it enough and many aren't free in the key locations. Will leave it til later and see how I get on. On the Polar network, you can also get an App that is effectively PAYG paying a fee for each charge you undertake but this is of course potentially less cost effective.
There are a variety of other charge points out there in businesses etc and I'll suck it and see with these until I experience a bit more of the reality of driving an EV..
I'm signed up with Ovo Energy for Economy 7 at the moment so 9p per unit overnight at home is pretty cost effective so no great hurry to charge elsewhere.
I am sure others will point out anything I've got wrong here or indeed if their experience might be more relevant to S England.