Indeed, one could probably find adherents to the notion that it's a far better way of starting off a nation than with a pack of bible thumpers with persecution complexes...
That was my last experience of arriving at Heathrow, direct from Bangkok, two and a half years ago.
There was immigration control, with the expected passport check, but Customs? Nothing. No one.
There is one way to find out if a man is honest -- ask him. If he says "Yes" you know he is crooked. -- Groucho Marx