"Since 11th, not only have passengers been prevented from carrying anything that could
be used as an offensive weapon but so have pilots who can no longer carry nail files,
scissors etc."
Sorry, this is not true. We're asked if we have them, but would they catch us in a lie? - mostly no. Changes in actual monitoring of passengers and carryon items are at best haphazard, some people are well briefed and have adapted. They get to the airport or gate to find other passengers still lugging huge carry on bags that are not searched.
If we do thwart a hijacking in the UK (and elsewhere), it will be because passngers fight knowing the alternative - not because security is suddenly able to combat a determined terrorist.