On a standard flight from New York to London, Concorde Golf Victor Foxtrot is nearing Heathrow Airport when its signal begins to break up. Before long all trace of the aircraft is lost - the Concorde has disappeared! Arriving at Heathrow shortly...
In theory the TARDIS should be able to change its appearance to blend in unobtrusively wherever it happens to materialise. In practice, however, because of a fault in the chameleon circuit, it always looks like a police box — a minor inconvenience...