Bet they used a very big lorry to transport the Pride Of Hull (as named by the AIS) to this location.
Strangely the vessel is showing the following details:
JIANGZHOU (IMO: 9208588) is a General Cargo and is sailing under the flag of Bahamas.
Her length overall (LOA) is 152.9 meters and her width is 32 meters.
Also she is shown as stopped. Not surprising really.
It is currently showing three ships in the vicinity - I suspect it isn't a coincidence they are all on the Greenwich Meridian
Edit - While on that site I notice that Escape now comfortably holds the world record for the largest ship. No idea how it managed to get up to Berthons as it now straddles the entire river and their car park