Thanks for all the advice. I will try bleeding the system when I get time during the week.
It struck me as strange that the overheat only started happening after a fair time of driving.
Perhaps some air got forced round to form a lock. I had it on full throttle for a fair period during the prior test drive without heating issues. It was as if something 'let go' which is why I considered the after pump. Although it is a 99 registration it is a 97 build so unless the pump has been replaced it might have given up.
On the bright side, the first tests suggest performance has improved, of at least not deteriorated
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