A burned Mercedes-Benz GLE tail light bulb or indicator bulb will lead to an MOT failure if you did not fix it before taking your car.
In fact, it is compulsorty to always have a set of spare light bulbs in your car in case of lighting failure.
This set ought to contain a couple of tail light bulbs or indicator bulbs for Mercedes-Benz GLE(P21W and PY21W) but also light bulbs for the front lights . If all present, you can leave in peace, knowing you will be well visible even in the event of a breakdown.
Indicator bulb for Mercedes-Benz GLE by model and power system