I have here in front of me a copy of the "Direction to Aircraft Operators, Aerodrome Managers, Security Approved Cargo Agents, and Catering Undertakings under the Aviation Security Act 1982 Relating to Heightened Security Measures 2001", which was issued by DTLR on the 26th September.
Without going into detail, it's clear that many airlines - and airports - are going well beyond the guidelines set down by the DTLR. There is, for example, no restriction placed on the presence of glassware or metal cutlery on board UK aircraft (though razor blades (both open bladed and safety razors) are on the list, as are darts and knitting needles).
Perhaps instead of trying to lull pax into a false sense of security with those rather pointless exercises, maybe they should be employing the 'Dunkirk Spirit' and showing that no matter what terrorists try to do, we will continue with our way of life - unbowed and unintimidated.