Please point to the law / section of the Highway Code that outlaws
'undertaking'.
--
Steve H 'You're not a real petrolhead unless you've owned an Alfa Romeo'

http://www.highwaycode.gov.uk/23.shtml#227

Do not overtake unless you are sure it is safe 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 your
mirrors carefully. 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.
and :- http://www.highwaycode.gov.uk/15.shtml#138

stay in your lane if traffic is moving slowly in queues. If the queue on
your right is moving more slowly than you are, you may pass on the left
hope that covers It
Derek




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