miketdt:
Surprised at ROG comment you need to add a bit more meat on the bone. Former Grade A ADI
If you start from the nearside and finish in the nearside, then passing traffic on your right-hand side is just “traffic moving slowly in queues” and not illegal.
HC rule 163 “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.”
(Slowly is not defined, I would consider 55mph pretty slow on a motorway)