Yeah, I contacted Lenovo and it doesn't seem like it'll be coming back - they referred me on to a third party seller but it's on there for £460 or so which I don't think is worth it.
In the end, I recommended the Acer Aspire V5-171. It's got the Core i3 2367M, 11.1" LED, 4GB RAM so quite nice specs, plus it's only 27.35mm thick and weighs 1.38kg. Main problem though it's only advertised as having 'up to 5 hours' battery life so that could be pretty disappointing, and there doesn't seem to be any decent reviews for it yet to check.
It can be had for £370 from a retailer which is named after the plural of a popular indian dish. With a SSD installed it should really fly.