Thank you, will get stuck into it. Cheers for your help, sincerely appreciated.

Really good points, appreciate it, im thinking so too. How would you monitor fuel pressures and where would i find what they should be to confirm diagnosis? Cheers for all your help.

thinking your right on the high pressure fuel pump, is the volume control value a removable part of the pump? just seeing that the whole thing is alot of money. also saw a post saying too much engine oil can do the same, any merit in this?

4.4 V8, have amended original post also.

2014 L405 LWB 4.4 V8 Autobiography @ 70k miles. When turning off, dash turns off immediately but engine takes maybe 10 seconds to turn off and makes a slight wobble as it turns off. This has been happening for a while. Most recently, has now begun struggling to start, and worse, once starts...