Very Happy... I went to the UK group and raised the question on there about my issue. Many owners were also saying that it was a problem with the RCU and pointed me to a UK parts dealer. I ordered the new RCU, which arrived today. As this is plug and play, I was able to fit the part in seconds. I am very happy to say that the old girl started straight away.
Thank you all for your help. Without your help, I expect that I would have ended up with lots of garage bills.