1995 xj6 jaguar, doesn't liketo start when cold,

You might be able to pour a small amount of fuel in carb. A little at at time to get it primed. Once started get some fuel system cleaner into fuel to clear out any condensation and build up from sitting. Other things - do an oil change, check steering and suspension bushings, replace fuel filter, pull and visually inspect spark plugs, let car fully warm up before attempting to move - let transmission fully warm up and change trans fluid at earliest convenience, Make sure tires are safe- pressure and check for weather cracking and flat spots. Check all belts and hoses. This should get you started.

Check the wires and firing order..??

I have had simmilar, is the fuel pump delivering fuel?
Is the fuel filter clean?
Are you getting a good spark on all of the plugs?
Have you got good cyl compression?

The fuel filter is mounted in a bracket underneath the body by the left hand side rear shock absorber above the drive shaft.

This is OK. Oil pressure is always higher when the engine is cold.

As an engine accumulates miles the pressure will start to drop due to bearing clearances increasing.

If this just started to happen you may want to replace the oil filter and or oil pressure sending unit.

The vehicle ignition coil , spark plugs and wires should be changed.

Timing out ,check it on no1 cylinder at TDC then check distributor position ,the arm is pointing at no1 plug lead

Fuel pump is bad or plugged fuel filter it seems. Crack the line from the filter leading towards the engine first. If gas starts squirting out fast, you have good pressue. If not the filter is plugged or a bad pump. How old is the fuel filter by chance? If original its plugged up by now

Yes you can check the Crank & Cam Sensors they can control spark and fuel. You can test them by finding out the normal resistance and then testing yours for their resistance. Do you have a way to scan the car? Did it quit while driving?

does it have a spark at the spark plug leads? if no it sounds like the crank shaft sensor!!