I am looking to start a UK only advertising campaign using PPC. Can anybody advise me of any UK specific, or general PPC (with region-targeting) advertising networks other than Adwords, Yahoo and MSN? Thanks.
In my experience, anything other than those can have difficulties with click fraud - you need a huge amount of resources to deal with the problem and most of the smaller ones don't have the ability to account for this. The big 3 search engines have most of the search market in the UK, and can all be geo-targetted to only show to UK customers. Bear in mind that with Google's search network you're also targetting users of AOL, Ask and others. However, if you have any vertical search engines in your industry they may be worth a look.