This rail on the track heading towards Salisbury is from BSC (British Steel Co.) Workington in 1977. British Standard BS11 113A is a standard for 113lb/yard flat bottomed rail, now CEN56E1. The rail rolling plant at BSC Workington closed in August 2006, when the mission was transferred to Scunthorpe. Latterly the steel blooms were supplied to Workington from BSC Lackenby, Teesside.
More on Workington:
The rail on the track towards Romsey is rather older, from 1961, and appears to be from Dorman Long & Co Ltd of Cleveland to BS11 110A. This standard was superseded by BS113A as
:explained here
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Dorman Long & Co built the Lackenby facility between their Redcar and Cleveland Works.
http://www.gracesguide.co.uk/Dorman,_Long_and_Co
http://www.ssi-steel.co.uk/about-ssiuk/history
http://clevelandindustry.weebly.com/about-dorman-long.html
http://mmrs.co.uk/modern-permanent-way/
Dorman Long & Co built the Lackenby facility between their Redcar and Cleveland Works.
http://www.gracesguide.co.uk/Dorman,_Long_and_Co
http://www.ssi-steel.co.uk/about-ssiuk/history
http://clevelandindustry.weebly.com/about-dorman-long.html
http://mmrs.co.uk/modern-permanent-way/