Have a look at the Tiscali Forum before you sign up with them. I signed up and then cancelled within 24 hours after reading it. Boy did I have trouble after that but its to long a story, make up your own mind.
The price at that time was the same as BT, but as stated Tiscali will have to activate your telephone line through BT but after the initial activation fee and the supply of a broadband modem, the monthly fee is all you pay.
There is a years contract as with BT so if you sign up and are not happy with it and decide to go elsewhere they will expect you to pay for the whole year.