The fine should have been £10 per mail sent.
That's 500 times the actual fine. All that would do would be to convince the airline to spend money trying to take power away from these bureaucrats.
All the voters care about is that the government is "doing something" - it doesn't matter at all if that "something" is effective.
This kind of tiny fine keeps the companies happy, the voters happy, and the bureaucrats happy. The minute percentage of the population that knows it's a scam does not matter - they still have to pay taxes anyway.