Below's my old Canon Ixus 300 lying on an AOL CD, so you can gauge the size.
Below's my new Canon Elph S400, photographing itself by timer in the mirror (flipped horizontally to correct mirroring).
As you can see the 400 is a fraction smaller than the 300.
This camera's replacement (the 700) can be bought online from Amazon.co.uk and Amazon ...
Ixus 700 at Amazon.co.uk
PowerShot S500 Digital Elph at Amazon.com
Amazon also offer full technical details and customer reviews for the camera.