Chatham Historic Dockyard Trust.

Specifications

Displacement:
1,535 tons full load
Dimensions:
94.5 x 10.7 x 4.7 meters (310 x 35 x 15.5 feet)
Propulsion:
1 shaft;
1 Parsons or English Electric geared steam turbine, 2 Babcock and Wilcox boilers, 15,000 shp;
25 knots.
This is one of two w/t boilers from a Blackwood Type frigate.
When it was removed,it was used to train Engineers at HMS SULTAN,the
Navy's School of Marine and Aeronautical Engineering,based at Gosport
Hampshire.
This may be from HMS EXMOUTH F84,as the steam plant was removed from
this vessel,and she was used as a test platform for Rolls Royce Olympus
and Proteus gas turbines.

See Chris Howells photo in gas turbine guise.
http://www.shipspotting.com/gallery/photo.php?lid=1588118