Aircon now working following replacement compressor. It had siezed. I get the impression that this is a common problem and a friend's Emira is in next week as Aircon has stopped cooling.
Similar problem with no aircon cooling from the beginning. Caffyns Ashford initially explained that it was a known problem with factory having "over pressurised the coolant" so booked in for few weeks later and told ok to keep driving. However we broke down with an alarming engine bay bang...