From space age electric tuk tuks to poo-powered tuk tuks, the idea of a cleaner ride is nothing new. Pictured above is yet another alt-energy tuk tuk, this one from a few years ago in Bangkok.

A British woman was caught straddling another tourist in the back of a tuk-tuk by a shocked Thai driver, who called the pair out on their 'inappropriate' and 'disgraceful' behaviour. Dismayed taxi ...