'faulty Foglamp' Showing On Display

[ABT]

Hi.

 

I have an 07 C3 Exclusive 1.6hdi, and intermittently the display shows 'faulty foglamp' and beeps and the 'serv' light shows on the dashboard - the display and serv lights clear in a couple of seconds.  This generally happens whilst indicating or braking, although all lights are working fine.  Would anyone have any ideas what to do to try and resolve this.  By chance the car passed its MOT last Saturday and this started happening last Sunday!  Many thanks in anticipation.

[coastline taxis]

Im assuming that its the rear fog lamp if so i would start by checking the earths and bulbs in the rear light cluster,