Why are you saying the limit of a UK power socket is less than 15 Amps? Why don't you quote the actual rated current of 13 Amps?
Anyway, the "specialist" high current 30 Amp charging socket is hardly much work to have installed. The house main fuse is generally 60 Amps or more, a 30 Amp connection regularly provided for cookers, so having a 30 Amp spur installed which feeds into the garage with a 30 Amp socket on the end is well within the capabilities of an electrician, they'll even have suitable cable and fuses/trips on the van due to the common cooker usage.
Just avoid charging when you're cooking dinner!
As for the super speed three phase, it's not that hard to accomplish if your neighbours also have an electric car. In the UK phases are generally alternated down the road, so every 3rd house has the same phase. This means you and your neighbour have different phases, and 415volts between you. Talk to the neighbour on the other side and you've got all three phases although I doubt the charger actually wants the three phases, just the volts. I'm not sure what an electric meter would make of this, and I know RCCDs will certainly not like it, but that aside, you've got your "juice".
All that aside, forget electric until they can do 400 miles (including having the lights, heating and radio on) and be charged in a few minutes... Oh, and that the power stations aren't cooking on gas/coal etc!
Not sure I like the idea of a super speed charger at a petrol station... They're paranoid about a mobile phone causing a spark already, can you imagine the spark a high speed charger must be capable of?!