Plans to fingerprint passengers at Heathrow's new Terminal 5 are being probed by the data protection watchdog.
The Information Commissioner's Office warned airport operator BAA it may be in breach of the Data Protection Act.

Under the plans, prints will be checked at the gate to try to ensure the person who checked in is the same as the person who is boarding the aircraft.

BAA said the data was encrypted straight away and destroyed within 24 hours, in line with the act.

The investigation would not delay the opening for business of the £4.3bn terminal on Thursday, the airport operator added.

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Prosecution possibility

The move will allow domestic and international passengers to mingle in the terminal's departure lounge.

The idea behind the fingerprinting is to make it impossible for a terrorist to arrive at Heathrow on a transit flight, then exchange boarding passes with a colleague in the departure lounge and join a domestic flight to enter the UK without being checked by immigration authorities.

But Deputy Information Commissioner David Smith told the Mail on Sunday: "We want to know why Heathrow needs to fingerprint passengers at all.

"Taking photographs is less intrusive. So far we have not heard BAA's case for requesting fingerprints.

"If we find there is a breach of data protection legislation, we would hope to persuade them to put things right.

"If that is not successful we can issue an enforcement notice. If they don't comply, it is a criminal offence and they can be prosecuted."

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