Hello I'm a Newbie

And I apologise for signing up in search of a solution to a problem.

The car is a 2002 Focus (1.6 Zetec) and the problem relates to the brake lights. When the tail lights are on the brake light is illuminated (both the filaments in each bulb are illuminated).

When the tail lights are off and I apply the brakes both brake and tail illuminates.

Also the centre brake light is illuminated when the tail lights are on.

Any help is gratefully received.
Nick