Just be aware that if a Tiscali payment fails (e.g. lack of funds), then they STOP taking any more payments altogether.
Each month the debt goes up, and eventually you get a debt collection agency letter. Apparently the direct debit or card payment collection doesn't restart until the debt is cleared.
They don't e-mail you to tell you, but they do send letters. Unfortunately these look like the paper invoice, so it is possible that you don't look at them closely. Especially if everything has happened properly previously.
Moral - don't just assume that Tiscali letter is "nothing to bother about".