Dont do anything to the box mate, be happy that youve got a 1000-phase-1b, the only excw box that will go to telewest (now that cr4 is upon us).
When the box is connected to the TW stream it will start displaying all mad numbers on the front panel, let it do its stuff, its just downloarding the TW software.
Also make sure you use the telewest files for the atmega card, NOT the excw.
edcase