Hello there. Yes, I did indeed have the wiper module off. The thermostat was still just about impossible to get at with the intake pipe in the way. What I didn't proceed to do, as I had at that point spotted I had the wrong replacement thermostat, was to have a look from underneath to see if the intake pipe could be accessed for removal from the turbo: anyone know? Luckily I hadn't drained coolant, so not too much time spent! Thanks.