I met some friends at the Coach Station one Sunday during that Siberia-like summer. My friends were tired having done the long journey from London Victoria and they were in no mood for sight-seeing. We headed straight for the pub for something to eat.

At the entrance to the pub we noticed a board with a small riddle written on it. The landlord invited punters who thought they might know the answer to the riddle to step inside for a chance to win a free drink.

What a neat idea. Would anyone care to help me earn a drink?