Buy BBC Audiobooks Ltd Christopher H. Bidmead - "Doctor Who": Logopolis (Classic Novels) online at Amazon (Books) › Price: £13.25

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 the Doctor hopes to correct.

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