Hello Anqua.
The key point in your quote is: “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”
So if you stay in your left lane maintain your speed you are not breaking the law, even though the traffic to your right is going slower or may be stopped (happens all day long on the M25 and other heavly congested A roads): When you come to the slower vehicle indicate pull out overtake pull back into the LH lane; ONE NEEDS TO BE ALERT!
Undertaking is when someone moves from the RH lane to the LH lane goes past people in the RH lane and pulls back into the RH lane, per your quote: "Do not weave in and out of lanes to overtake"
Hope this helped a little.[msnsmile2]
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