I made two business trips to Munich since 9-11 and I passed through Heathrow on both occasions. The security was nothing special in both airports. I was not questioned at the ticket counter nor was I questioned when I passed through passport control.
OK Lu, so you are the kind of person who doesnt believe that he has been properly screened if you are still wearing more than your daks? If so then the TSA style is for you, enjoy. Security however is about more than shaking people down for pen knifes and missing fully loaded pistols. Maybe you didnt look suspicious? maybe they were observing you from behind one way glass? You think its necesary to treat every passenger like a terrorist. I used to work at Heathrow so thats the benchmark for security for me, was working there when our Irish friends lobbed a couple of mortas from the carpark by A block...... OK not a good example of LHR security