This is an extract from the list of requirements for MOT Lighting test. If we are talking about the lights fitted as an optional extra in the bumper area they appear not to be included in the test as they are not in the list of "required lights".
"MOT Test of Lights:
The headlamps are checked for alignment with a Beam Setter. After first aligning the equipment with the vehicle, the left and right headlamp beams are checked to ensure they are correctly set so as not to dazzle other road users.
All required lights are checked for operation, condition, security. Side lights and headlamps are the correct type and colour dip and aim.
Stop lights, indicators and hazard lights* - are the correct type and colour, do not interfere with each other in operation, driver's tell-tale works with respect to indicators, or there is an audible warning system.
Rear Fog lamps** - must be fitted to the centre or offside of the vehicle tell-tale must work, must not be affected by other lamps and not be obscured, must be red.
Number plate lamps - All lamps fitted must be working.
Rear reflectors - There must be two red reflectors fitted reasonably symmetrically, securely attached and not obscured.
- Must be fitted to all vehicles first used on or after 1st April 1986, but if fitted, must be Tested.
** Must be fitted to all vehicles first used on or after 1st April 1980."