Micheal LYNCH above had this guesstimate Reyrolle, 10,000, shipyards 5,000, other industries (Baker Perkins, Pyrotenax, Bitumastic, Whites, RWt, Bushing Company,Coke Ovens,Council,Thubrons, Education,shops) another 10,000 - 25,000 in total, which sounds about right...