Apparently the walk from the block of flats where Jean Charles was picked out to the bus stop takes more than five minutes. And then he had to wait for a bus. Then a bus ride taking 20 minutes during which he was observed. And no attempt whatsoever to stop him walking leisurely into the train station, picking up a copy of a free newspaper to read on the train, and go down the escalator.

How this squares with the fact that the orders of the day were reportedly (and sensibly) to intercept as soon as possible away from the immediate address, and not to allow the person suspected to get into any station...

It is hard to escape the conclusion that some pretty incompetent police work was involved. It doesn't in any way help the police to try to evade that, or to try to conceal the errors - in fact doing that makes the work of the police a lot harder.