sorry Steve, I'd say that's the riders fault. I believe the correct name for riding up the outside is filtering and it's perfectly legal. If I was coming up behind two big vehicles then I'd tip toe round like a seal in a shark tank, especially if I couldn't see what was infront of them.
I have a similar problem coming down Greek St of a morn. I filter down the outside so I can turn right onto the A6. There's a keep clear junction just before the bus stop and I always approach with caution.
I can recommend Elixir R brakes, by christ they're good.