Thanks for all the help, plan of attack is to work my way round the coolant system with hose pipe to try and find any blockages. Will also remove thermostat in that procedure to be thorough. Might not get round to it until the weekend due to having no light after work.
Just ordered a new expansion cap, for a few quid I'd rather discard that as a possible issue.
Will update as and when at the weekend
Wayne
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