I don't think overtaking on the wrong side of the road is any more dangerous than filtering up the inside. Certainly lessens the chances of hitting a pedestrian or having a door opened into you.
If you're passing a line of normal cars you usually have a very good view of what's down the road, be it someone turning out of a junction or whatever. Unfortunately there are so many chelsea tractors/vans/buses around the place that you need to be even more aware of what you can't see, because that's probably what will get you in trouble.
I don't think overtaking on the wrong side of the road is any more dangerous than filtering up the inside. Certainly lessens the chances of hitting a pedestrian or having a door opened into you.
If you're passing a line of normal cars you usually have a very good view of what's down the road, be it someone turning out of a junction or whatever. Unfortunately there are so many chelsea tractors/vans/buses around the place that you need to be even more aware of what you can't see, because that's probably what will get you in trouble.