Well, I rushed to Argos when I woke up in the morning and bought the Telecam indoor antenna. Unfortunately, it didn't work. It didn't pick up even weaker analogue signals. I am afraid that the area I am leaving is positioned lower than other areas and that's why the signals are so weak.
The alternatives are: subscription to telewest or sky; or fitting a new external outdoor antenna on the roof. The landlord will not allow me to subscribe to sky or fit outdoor antenna, because, as I said, it will cause some changes on outside appearances of the house.
So? I think I have no choice to join Telewest.

The problem is the want me to join phone service as well when I buy starter and essential service. As I am under contract with BT for 6 more months, I don't need to do that. Well, so my choice should be only one: Telewest "Supreme" package. Oh gosh! This costs £22 a month! Well, I don't want to spend as much money as for this digital TV! I don't want 100 channels!