Brake Lights won't turn off

Hi All,

Hope you can help, I have an aging Renault Megane Convertible/Cabriolet, 55 plate diesel engine.

A couple of days ago, I got a 'Electronic Fault' message on the display and the Service light, today it became apparent what the problem is, the brake lights won't turn off (when the engine is turned on).

This is obviously a problem, Renault will charge me a fortune if I take it to them and a number of other local garages have had trouble diagnosing faults on my Megane before.

I'm hoping it's something simple that I can fix such as a fuse, can anyone give me any advice, I'm not too knowledgeable about cars (I know where the fuel goes and the on button is :o).

Thanks in advance.

Brake Lights won't turn off