Airport security is a serious business, but why was a Reg reader refused a Krispy Kreme doughnut at Heathrow airport?

Admittedly, the sugared snacks contain enough cooking oil and sugar to power a trailer park, but who knew they could be fashioned into bombs?

On Saturday afternoon a Reg reader was dropping some friends at Heathrow and stopped off at Krispy Kreme doughnuts outside Terminal 3.

But the reader was directed to the unstuffed ring doughnuts rather than a full-fat, fully stuffed Krispy Kreme special because the fillings fall foul of security restrictions.

"Imagine our confusion when the guy serving us advised that we could only buy ring doughnuts, not filled, circular doughnuts. A moment or two's wrangling in broken English and we discovered that he thought we were outbound passengers.

On further questioning, apparently the liquid contents of a filled doughnut fall foul of the new restrictions on liquids in carry on luggage. Quite how the authorities imagine that a terrorist could blow up a 747 by rubbing two Krispy Kremes together was a bit beyond us.

But a spokesman for BAA denied they were stamping on Homer's favourite food. He said: "Passengers can take liquids in 100ml bottles carrried in a clear plastic bag. But passengers use common sense on foodstuffs. Sandwich fillings and the like are not restricted."

In fact, the only foods still on the restricted list are: "Liquid-based foods, sauces, stews, soups over 100ml in size."

Drinks suffer the same restrictions, but there is no mention of doughnuts.

The real restrictions are available here on BAA's site. ®