862/3YPU Leyland Haydon PEST EssexOne of the Firemaster pump emergency salvage tenders. They were allocated to Grays (862YPU) and Colchester (863YPU).
Note had front mounted 1000gpm pump. 300 gall tank, EPCO hydraulic gear. Full details in Fire Engines of Eastern England page 82.
The photo below shows quite clearly how the two door cab had the OIC's seat in the centre, with two side bench seats facing each other for the rest of the crew. This layout enabled everyone to access the center aisle body, like a classic ET of this era.
Courtesy Geoff Pritchard collection acquired via the Fire Brigade Society.

Picture added on 18 August 2024 at 11:07
www.flickr.com/photos/22455491@N02/51186571744/
Added by Petros on 18 August 2024.