A 1,000 ft (304m) long maze in the shape of a Dalek has opened near York to celebrate the 50th anniversary of television science fiction drama Dr Who.

The doctor's extraterrestrial arch-enemy has been constructed by cutting more than 6 miles (10 km) of pathways in a field of maize plants in Elvington.

The attraction was opened by actor Colin Baker who played the Time Lord in the 1980s.