Simple webcam with microphone, but hopefully better quality than a no-name cheapo one. 2 good Reevoo reviews. Comes complete with Arcsoft Video Impression and Arcsoft Photo Impression.
If Tesco's price comparison figures on the page are correct, this is £18.99 at PC World/Dixons/Currys. Is this it? http://www.pcworld.co.uk/gbuk/hewlett-packard-au165aa-pro-webcam-07289180-pdt.html
Free to collect from store, otherwise add £5 delivery