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Morning Stu First engine running and Voltage check at the charge points the alternator should be providing 14.5v min (normally 14.6v) so battery will be slowly drained. But as you know low voltages can throw up all sorts of issues. Battery at rest 12.5v is OK healthy battery, alternators are tough so I would suspect the Voltage regulator Looking at your scanner the throttle body is sticking so needs a clean out Not unusual for the Drivers seat control unit to go AWOL on the E53 and that does affect other functions (steering wheel adjustment if electric) so that needs a look and maybe unrelated Good Luck lets hope it's the simple fix Dave As for the Porker tyre, I have a small compressor and a Tyre Plug repair kit (tempt fate now) I have used it 3 times all on friends and neighbours cars not mine and it works really well. The last time was on the shoot in the middle of nowhere a Disco with a flat front tyre and like most modern cars no spare we could see the puncture (a screw). Let the air out of the tyre pull out the screw clean the hole with the tool in the plug kit insert the plug with the tool provided and trim it off pump up the tyre, job done and we didn't even take the wheel off the car that was last year and he is still driving on it. Though the kit does advise get it fixed properly. All of the 3 I have fixed have driven on the repair until tyre change time. That would be the route I would take, I have seen compressors for around £20 and my plug repair kit was £10

Morning Nick Just looking at those initial screens I am not surprised your having problems 1st screen tells you that several control units are not communicating correctly as they have faults stored light brown colour and one greyed out and another is red not operating at all 2nd two screens show a list of faults and an explanation of what they are Your first job is the Control units they should all be in the Green. You need to investigate each one in turn to fix the faults. Once a Fault is repaired the fault will remain in the memory unless cleared by you. Clearing a fault doesn't fix it though it may allow normal running for a period until it returns Next stubborn faults remaining may need further investigation. ISTA is a very powerful program but it can't fix things you have to do that. ISTA will give you a test plan to rectify it also contains workshop information and wiring diagrams plus pictures of components and where they are located it will even list tools required. Dave