Hi Chris and welcome. As the engine has been stood for so long, remove the plugs and put a teaspoon of oil down each. Wait 5 minutes and then spin then engine on the starter for 5 - 10 seconds. Replace the plugs and retest the compression, if still the same then you start dismantling.
Any Jaguar independent specialist should be able to read the codes for you.
A icarsoft i930 code reader would also be useful to you.
What appears to be the problem?
Welcome to the forum.
I would start by fully charging the battery despite it starting the car especially seeing the first and third pictures. Once charged, try again.
Welcome to the forum, Ron. This electrical manual may help you identify the circuits you’re having trouble with.
http://www.jagrepair.com/images/Electrical/Elect-Tech All2/90 Sedan Electrical.pdf
Yes you can, they are designed that way. If they haven’t been moved for some time then spray some lubricant into the swivel point and just keep wiggling them until they are in the park position
Figure 09.1 of this manual refers, http://www.jagrepair.com/images/Electrical/XJElectrical/2006 MY XJ Electrical Guide.pdf
follow the lines back from the lights that don’t work, should help you narrow it down.
Please bear in mind that some of the codes you retrieve will be historical. Write them all down and then clear the lot, take the car for a drive and then see what codes, if any, come back.