Ok a quick trip to the indy, he hooked up vcds and noticed an alarm code there. Incorrect air mix or something or other related to a pcv solenoid?....anyhoo.....apparently it can come on for a number of other issues..
He noted the fault, and cleared the condition. We will monitor and book in, the tech reckons whatever it is that it should be a simple fix and not expensive.
Deffo nothing to do with the fans.
I did notice that my air intake top cover was slightly off...wonder if this had something to do with it. We snapped it back on, though I am not sure if it will stay there.... Will keep ya all posted just in case the same ever happens to you.
A quick check with an INDY...a hook up to a laptop and some diagnostics and in 5 mins we have a plan...so much better than booking into Arnold Clark and getting charged £70 to have a look! P'Ah!