Just found a figure for the real cost of a complete battery for a ZE. This information is for the Korean Samsung version of the car whose LG battery pack is priced at $20, 803. Roughly £12500 by my estimate. The LG pack is rated at 24kW.
While the Renault version seems to have stopped, the Korean version (with a more traditional front styling) expects to sell 4000 units in 2014. Still a very low figure for a mass produced car, unless they are only ever intended to be practically hand-built? I've failed to confirm whether the Samsung has faster charging. If so, and if they do a rhd version, maybe we might see a few imported.
Of course, my information may be out of date. It really annoys me that si much internet material is not dated.