When the detective and the SFO officer are chasing Henry, they are "seriously winded" when they catch up to Henry after what seems a short chase. Yet, in their first meeting in the first episode, they're running and biking in a race that resembles (or is) a marathon, essentially winning the race until they screw up by trying to make each other fall behind. They sure fell out of shape quickly.
The final panoramic shot back across London has been doctored to insert the dome of St Paul's in a place other than its natural location. From where the final scene is shot (Montpelier Vale, Blackheath, in south-east London), a high line of sight which has the Shard and the City on the right would probably have St Paul's hidden behind the Shard. But it has been clumsily photoshopped into the view, seemingly somewhere around Lambeth.