In furthering my quest for information about the Tenterden Titan I contacted Chris Allen who has contributed a considerable amount of pictures and data about industrial power systems.
This is his response:
Re: image for
TQ8833 (Tenterden Titan)
TQ8833 : Tenterden TitanHi Peter,
There were at least two major uses of portable boilers. One was for soil sterilisation for nurseries etc and the other was in naval dockyards to supply steam to ships that had their own boilers shut down. There are examples of both surviving. There is a book that lists this sort of thing but this one has escaped the author.
Chris