Hi all,long time no post!

Can anyone tell me where the reverse sensor/switch is on a 1.25 zetec motor pls(photo's would be helpful too for anyone else for future reference)?
My reverse light has packed up and I'm sure its the sensor,its not the bulb as my rear lights work ok and it has been an intermittant problem as when the reverse is engaged,the light goes on but let go off the gearstick,it goes out.

thanks in advance.
Andy