Motorcycles in your bus lane

On the advance stop line thing, well perception is everything. Most road users ignore them including motorbikes (and cycles who usually sail straight past them), but at least if there are motorbikes in there there is probably room for cyclists too. As I said, I personally respect them and keep out unless (and it's a big unless) my safety is better served by entering it (Admiralty Arch onto Trafalgar Square comes to mind)

Ooh. That's my normal commute - Admiralty Arch into Trafalgar Square - and my personal bug bear for motorcycles/mopeds in the ASL, the feeder lane and the cycle only lane under the Arch. I often cannot get into that ASL due to the number of motorcycles and mopeds that block it up.

Out of curiosity, why are you ofter better off/safer in the ASL at that intersection?