I have just done a bit more testing after the latest failed start - I left it on the Mondeo jump leads on and after the start reduced the CTEK down to '3' it quickly got back up to '6' and I thought I'd check the battery level on the 'car' menu again and was surprised to see it at 100%.
I then attached my VCDS cable and done a 'AutoScan' which revealed some interesting results - attached. Since clearing all DTC's I have been unable to run another scan, I get an error saying 'function not supported' which I suspect is low voltage issue...
I'm a bit dubious about removing the Mondeo battery as its a company car and I may need to code for the radio etc... it has crossed my mind though!
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