It remined me of that 'things you learn from Hollywood' list:
No 27: Someone will easily *nearly* catch someone else up no matter how much of
a head start they have but will not be able to cover the last 20 yards no matter
how long they try.
I don't know who would be fastest through London (although I have my suspicions
- how fast can a skater go in those situations before the lack of decent brakes
becomes a liability) but I'm damned sure that the would not be that close for
that long - certainly not without the leader changing from time to time.