Spotter cards: What they look like and how they work

This kind of highly confidential document – pictured above – is rarely seen by the public.

These so-called "spotter cards" are issued by police to identify individuals they consider to be potential troublemakers because they have appeared at a number of demonstrations.

The photographs are drawn from police intelligence files. This card was apparently dropped at a demonstration against Britain's largest arms fair in 2005.

H is Mark Thomas, the comedian and political activist. Asked why it was justifiable to put Thomas, who has no criminal record, on this card, the Metropolitan police replied: "We do not discuss intelligence we may hold in relation to individuals."

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