Previously the series had been shot on 405-line videotape, with very little provision for editing and virtually no location footage.

As with the television series, a large amount of the action took place outside with location footage.

The location footage, at Marylebone station, was filmed on 12 May.

Some critics feel that the series has dated badly, with weak plots used as an excuse to string together location footage.

Once sufficient location footage had been obtained, interior sets were designed and constructed in the studio.

A double plays the role of the Doctor in all the location footage, his face being clearly visible in some shots.

Along with the unique theme, the series was among the first daytime dramas to be broadcast from California and to shoot location footage.

Prior to this, the show had used videotape for studio scenes and film for location footage.

No doubt we'll see all that location footage recycled during her future campaigns.

Additionally, location footage was shot on 16mm film, of the type used for location filming at the time.