Once in force, the system will allow UK passengers to have their fingerprints taken and faces scanned in order to enter the bloc.
It has been pushed back yet again after Germany, France and the Netherlands said their systems were not ready.
Separately, sources have told the BBC that there has been no live testing of the EU’s software on the UK’s border systems.
The delay is the latest in a long line of setbacks for the system, which was originally meant to be introduced in 2022.
The EES will apply to road borders, airports, ports, train stations – including Eurostar services – and at all other external EU borders.
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