Electric cars available that can do this trip
Nissan LEAF, Mitsubishi iMiev, Citroen C-Zero, Peugeot iOn.
All available (from March 2011) for around £23,000 net (I.e. After £5,000 government subsidy).
All capable of 80-100 miles per charge and DC FAST CHARGE of 0- 80% charge in around 30 minutes.
Nissan dealers all the way across and up Britain will have DC fast chargers. Hopping from one to the next, you could do the journey with about 3 hours charging time plus the driving time. Say 9 hours all in. Not perfect, but at least it answers your question.