I recommend checking out ISPReview for loads of great reviews and information on most of the well known ISPs. ADSL24 is rated as the 8th best ISP with 8.5/10 stars, and I can confirm that I will be switching my internet to them within a few weeks. PlusNet isn't rated so well, and has an average of about 3.5/10 stars lol. Tiscali has about 2/10 and Nildram has 3/10.