electric car question

[rootbeer7]

Fellas (and ladies of course), living and working in London, I'm seriously considering getting a Nissan Leaf. After borrowing one for a few days I have to say it's amazing. No tax, no congestion charge (£10 per day) and free charging in the car park. On a full charge, I can get at least 2 return journeys. My only concern is at home where the charging cable won't reach from the house. I've been told I can get an extension cable (high amp) measured and extend the 6 meter cable. The question is will this work or is 6 meters the optimum length? Thanks in advance