That's only 3m long! Be very sure it'll reach your car, in all possible parking permutations, and what if you swap car for one with socket on the opposite side/end? I'd want the 8m one, myself...Just done a quick search and was surprised, that considering there's only one plug on the end, they cost roughly the same as untethered. ..
With VAT included it's £90. I thought it would be much cheaper.
Have you looked on evbitz.uk to see what's available there?