Proposing still greater surveillance of each of us as we go about our daily lives, the Prime Minister now wants our luggage to be searched at busy railway stations.

Could a supporter of this policy please explain what possible benefit it would bring?

There is no reason for a bomber to board a train at Glasgow Central Station or Edinburgh Waverley while it remains possible to board trains at smaller unmanned stations. Nor, indeed, is it even necessary for a bomber to board a train.

During the 1990s, several bombs exploded on British railway lines. Screening baggage at the busiest stations will do nothing to prevent such simple attacks.

A more successful strategy for preventing terrorism would be effective screening of those seeking election to government.

We could start by eliminating those who believe illegal wars and authoritarian security theatre are the route to a peaceful and happy society.

Geraint Bevan, 3e Grovepark Gardens, Glasgow.