Welcome to Blackheath Demolition and Trading, Established in 1989, we offer a wide range of quality items at a very competitive price along with a friendly & helpful service. We are demolition and reclaim specialists so much of what you see has been sympathetically taken out by our team. Situated on the River Colne in the historic town of Colchester, Essex, (Britains oldest recorded town), in an old Victorian Granary comprising of over 10,000 sq.