Was going to fit a towbar on my focus estate 2002 51 plate and tow bars seem simple enough but the electrics are a bit confusing in that I dont know if i need a bypass relay - question is how would I know?

In one of the adverts i read there is this on Q+As;

Do I need a bypass relay kit?
Vehicles fitted with bulb failure devices or cam bus systems and LED systems will require a bypass relay kit. A 7 way bypass is designed for vehicles which have Multi-plex wiring, Cambus systems or Bulb Failure devices which where introduced around the year 2000. This bypass prevents any faults on the towing vehicle's light system by switching power directly from the vehicle's battery/alternator to the trailer/caravan light system, using very small signals from the vehicle's light system, without the vehicles check control sensors system being adversely affected

If there is anyone on here in Cumbria that is taking off a full unit then i may be interested in it.