Thank you for the instructions.
Returned to the airport car park after leaving the car for 2 weeks during a holiday in Spain and the air con was dead.
Did not enjoy the 30 mile journey home on a warm Sunday afternoon with 2 tired and hot kids in the back.
Anyway, arrived home and straight to the internet for solutions to the problem and there it was. There may be criticism of the internet for some of the content available but to find this stuff on line is great.
Managed to pull out the old part in the evening and phoned the BMW dealer first thing. Yes they have the part in stock. Picked the part up from the dealer next morning for £50 and fitted it while in their car park.
Drove back home in air conditioned comfort.
Thanks again and whenever you are in Mansfield, England pop in and I will buy you a beer.