The guy is most likely to be Mark Windless, who runs Marks Model Boat Bits from his home in Christchurch, Newport, Gwent.
You may contact him via the MMB website for which the link appears in Malcolm's posting above. Have a seat available and maybe a supply of coffee if you telephone him. His enthusiasm knows no bounds!
Other water-based steam/smoke generators are available. Model loco units tend to be the oil-burning type.
Dave M