that by undertaking you are breaking the law and wouldn't have a leg to stand on if they hit you...
Rule 267
Do not overtake unless you are sure it is safe and legal to do so.
Overtake only on the right. You should
- check your mirrors
- take time to judge the speeds correctly
- make sure that the lane you will be joining is sufficiently clear ahead and behind
- take a quick sideways glance into the blind spot area to verify the position of a vehicle that may have disappeared from your view in the mirror
- remember that traffic may be coming up behind you very quickly. Check all your mirrors carefully. Look out for motorcyclists. When it is safe to do so, signal in plenty of time, then move out
- ensure you do not cut in on the vehicle you have overtaken
- be especially careful at night and in poor visibility when it is harder to judge speed and distance.
Rule 268
Do not overtake on the left or move to a lane on your left to overtake. In congested conditions, where adjacent lanes of traffic are moving at similar speeds, traffic in left-hand lanes may sometimes be moving faster than traffic to the right. In these conditions you may keep up with the traffic in your lane even if this means passing traffic in the lane to your right. Do not weave in and out of lanes to overtake.
Personally I regard my safety and that of my passengers higher in my list of priorities than my ability to get from A to B quickly
At the end of the day other drivers cause annoyance, be it tailgating, undertaking, talking on the phone, indicating to go round corners - but I prefer to maintain a good driving standard by not letting other's bad behaviour affect my own - i work in an area where the majority of road users probably didn't even take a UK test, so it's best to concentrate on keeping myself out of trouble than adding to it