Just an update to this. The thermostat had a rubber coating and this had started to come adrift and was preventing the stat from closing. More of an issue was getting access to the housing. Even with the power steering pump out of the way, the aluminum bracket also holds the alternator and the A/C pump. All of a sudden, it started to look like a massive job! In the end, I ground a small part of the bracket away to give me access. Job done and all good.
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