Thanks for the help OAP Pete, apparently the temp sensor was faulty. Was giving some rather silly temp readings. This was changed and all seemed well…or so I thought! Started on the button but after driving it for a few miles today for the first time on the way back from the garage, the revs started hanging at around 1400 rpm from 950-1000. I got it home and switched it off. Tried starting again and didn’t want to know. Left it a minute and tried again, spluttered a little bit eventually started with the revs staying at around 1400 rpm. Switched it off a few times and started right away, few minutes later didn’t want to start again. Gave up and left it for today. Will try again tomorrow but I’m just so confused! 🤔