or get a full-fat smart phone for less money - t-mobile vivacity
S40, wow, so last decade.
If I can buy a t-mobile vivacity, unlock it, and get a 5mp camera, better screen and better apps, for half the price, then how can you possibly say "the Asha 311 has much to appreciate. It’s cheap," It's not even that.
You've already done a <£100 android test which has several phones that beat the pants off this.
If I want cheap for the "but as a backup or travel phone or your young’uns first handset" I want it either sub £30, or rugged and water proof.
This is neither, You can pick up loads of S60 and S40 phones cheap on ebay, why...simple nobody wants them, there are better phones about now.
If you really want a backup emergency phone, then I'd take a 6210, which has days of talk time, and weeks of standby!