Well, that's what I thought but my experience in London is that everyone pushes to get into them when you can choose a position further back... Then there's the fact that you are technically being illegal by crossing a solid white line to get into them, so they made a cycle lane - up the left hand side!! with no solid line to lead you into the ASL box. Beyond that there is no legal support to ASLs and cycle lanes... as far as I could make out - apart from if there is a solid white line to the lane, cars can't cross into it and we can't cross out of them... another reason for me to hate cycle lanes
And for Doug, whose post I've just seen - ASL stands for Advanced Stop Line.
Yep, definitely mentioned lh side of trucks and buses. Some interesting bits about positioning which I thought good, if obvious, but which not everyone seems able to work out for themselves. The guy speaking advised always sitting behind a car/vehicle (big vehicles especially) so that you can see and be seen in the rh wing mirror - for some reason he discounted the rear view mirror in a car... on the basis that drivers predominantly use the rh mirror rather than the lh.
The City of London Police are visiting businesses in the City doing this presentation so you may want to keep an eye out for it or suggest it to your higherups... They might contact some of us (at the talk) to arrange becoming trainers ourselves.