Did the cam belt survive? If not you could be looking at new valves and if one or more broke new piston. I would take off head first to see damage.

What you could do with knowing is the current for each glow plug. If using clamp on meter that would prove connection and glow plug heating up.

First thing is to get it running, any bits missing? Battery good? New fuel in? From there other options like easy start. If doing it yourself, it's only nuts bolts and magic, get a code reader like the ebay elm ones with phone app(free is good). Decent six sided sockets and any other tools...

Possible, in my freelander 1 I had an insurance tracker plugged in, that was constantly powered. Although the drain would be very small. 3 to 4 days I wouldn't expect any difference so maybe the cold has tipped the battery over the edge.

I found a syringe, can get from chemist, is useful for filling as long as you don't squirt it too fast.

Are they higher than the filling plug? Worst case some oil comes out and you can refill.

Try the manufacturer for opening instructions or if they can recommend a lock smith. For 300 you can buy a nice angle grinder and new cabinet. Just grind the gap between door and cabinet then fit new lock

But didn't say where the noise was from!? No noise when stationary would rule out pump. I'd start with the brakes and pads first if they need doing

As far as I know all it needs to see is a resistance across the terminals to clear the light. If you could find what the value is then you could isolate the circuit.

You can have a motor trade policy for purpose of repairing cars or testing etc. Adrian flux do a add on to give you comp cover on any car as long as your policy is with them.

Depending on your reason, would a part time motor trader suffice?

Nice brekkie at nefyn golf club

If you put oil down the bores before compression test, a higher reading would indicate rings as the oil temporary seals it.

Cheap tap and die set to clean the threads, I can put them in by hand. A strategic hole under the front 2 bolts saves taking off a layer of skin. But the tray often doesn't get put back on straight away, getting it lined up on your back is worse than a gearbox install. The spanner is always...

No problem if it starts working again and I imagine once broke it'll just stay open. Not heard of one going closed.

The pictures from @Arctic2 as so helpful, thanks for putting in the time and effort

Same here, I can't leave it overnight with the handbrake on or it sticks.

The handbrake lever, bottom of pic 4, needs to be free to enable the handbrake to release. It's a little lever.

Probably the radio itself.

Maybe some help, an e4 error on a rover is inside temp sensor issue. Where it is I don't know. But I looked for e4 air con fault rover. If you can find some images it may be the same system.