It's seven in the morning and we kneel in black mud on the freezing banks of London's River Thames in the shadow of St Paul's Cathedral, where a church has dominated the ancient city since the 7th century.
As the tide ebbs exposing the shore, Steve Brooker casually tosses a 17th century trader's token he has found in the dirt into his bucket.
"Remember it's all about getting your eye in," says Brooker, who, armed with little more than a trowel, gloves, obligatory boots and an infectious enthusiasm has been combing the foreshore for antiquities for the past 20 years.
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