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If there is no STB being used, this is whatever historic unscrambled arrangement Telewest have in the local area, if indeed it is Telewest. It might be ntl, or somebody else.
Many of the Cable providers took over networks initially installed by local authorities or similar, especially in the new towns, so there were only a few communal aerials. As in those areas people wern't obliged to subscribe to cable, the cable co is obliged to pipe some free to air channels in addition to the subscriber services.