This seems like a reasonable deal, with no vouchers, cashback or other hoops to jump through to get the price. There is no HD video - only VGA - and CHDK firmware isn't supported.
They also have the same camera in Aqua instead of Silver.
The cheapest price has been £59 for a short time in December from M&S, or £84 including delivery after that. They don't do quidco.
* Slim 12.1 MP IXUS
* 28mm wide, 4x zoom. Optical IS
* 6.8 cm (2.7”) PureColor LCD II
* Smart Auto, Smart Flash Exposure
* Face Detection, FaceSelf-Timer, Auto Red-Eye Correction
* Motion Detection Technology
* DIGIC 4
* Creative shooting modes
* VGA movies