In 1853 the Illustrated London News reported that the corn exchange and ancient market house at Watford had been destroyed by fire. Read the Full Report to see details of who was affected.
I have appended to the report an engraving showing the old market house, from Hassell's Picturesque Rides and Walks with Excursions by Water, Thirty Miles round the British Metropolis, published in 1817/18.