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Looks like a tired MkI (possibly MkII), serial number ? 4562 (Possibly P or R). I've seen the pic somewhere before, taken at a RN training base, but can't remember where or when. I'd need to check the serial to establish what/where/when etc.
Just wondering what the guy on the wing is doing - the fuel tank filler is above and behind him, and, as far as I know, the oil tank filler wasn't in the wing root, and that looks like an oil tanker trailer behind the tractor.
Presumably a posed shot for PR purposes - especially as the ratings are in whatever they call that uniform rig, and not 'working dress' overalls.