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Hi ShaunCorbs,
I opened it, there are 3 wires, one is half green half yellow, another is blue, and a 3rd is brown.
so 2 wires as green / yellow is an earth
the problem you have is no neutral which takes a new stat range from + or - 5dc to + or - 1dc
you have three options
replace with a battery digital one or get a heating eng/spark to run a new cable 3 core + earth and fit a new stat
or the third get a rf stat fitted
in the correct place eg 1.5m from floor and if a rad is there no trv to be fitted just normal lockshield