I have to say the number of new super chargers added in 2016 in the UK was a let down on what Elon promised. I think its important that these charger cover the UK's main arteries to at least the same level as the Ecotricity network and more if possible. In the sort term surely tesla could do a deal with Ecotricity to enable Tesla owners to use their chademo chargers for free whilst they build out the network? Tesla need to work harder to roll out stations in the areas of the country without any superchargers. When I take delivery of my X I am sure I will use these a lot and am lucky that my main route seems well covered but I have already read on these forums that the chargers I intend to use such as Winchester and Brent cross are often full as they only have 2 stalls so clearly the number of bays need looking into also.
I agree the rollout of SC's last year wasn't great and there are gaps in the network but there is no way the SC network either will or should match the Ecotricity network in terms of number of sites. As I posted above, the SC's are there for long distance driving, e.g. more than your battery can manage in a day before you get back home, or to a destination charge point. Any Tesla can manage approx150 miles in a day worst case scenario , so unless your round trip is over that (or whatever your Tesla can manage - I've said 150 as that's what I think my S 60D will do worst case) charging doesn't come into play.
This is starkly different to the Ecotricity network which was/is aimed at the lower capacity EV's, e.g. the Nissan Leaf. I'm ready to be corrected but think the Ecotricity network was partially funded by Nissan. They are there to serve different markets, but thankfully the CHAdeMO adapter means Tesla users can plug the SC gaps, albeit at £6 for 30 mins unless you are an Ecotricity domestic user and then the first 52 are "free".
Ecotricity and Tesla had a major bust up, the details of which I'm not familiar with, but the net result was Ecotricity had a monopoly of charging sites at motorway service stations. Tesla had no option but to put SC's where they could, hence the 2 bay sites at places that you wouldn't choose, e.g. Sainsbury's at Badger Farm and Norton Hotel. These will be replaced in due course, and obviously the quicker the better. All new sites seem to be at least 8 and preferably 12 stalls, which they will need to be to cope with the hopeful influx once the 3 hits the streets, although that won't be for at least a couple of years or so.