A couple of the guys on D2BC have fitted that one - apparently just needs the connector on the cable changing for the one from the old fan.

From the water pump via the cylinder block into the oil cooler and then back into the cylinder block.

If by blocked you mean the hole doesn't exist on that port, then it's fine and you can leave it. The updated radiator design is supposed to be like that.

While you're at it you'll want the gaskets and O-rings for the two filter housings if they're not included in the oil cooler repair kit.

15p TD5 engines were first fitted to D2s well over a year before the facelift was released

Yeah - a leak seeming to come from the top of the tank is probably the green pipe.

I think they're only available from LR - I needed that set of hoses last year and couldn't find them new anywhere else. I got mine from JLR Classic Parts. https://parts.jaguarlandroverclassic.com/parts/index/part/id/14.55788.56208.59954/brand/land-rover/

The two hoses that run along the chassis are only available together - LR do sell them, but they're not cheap especially the earlier one (to VIN3A828006) which is over double the price of the later one. The connectors are 7.89mm.

Maybe it's fine if those wheels are designed to be nut centric

Correct, same bore size as the D3 etc so spigot rings and new wheel nuts needed to fit them to a D2.

Use the indicators on the front of the camshaft to time it as shown here: https://www.landyzone.co.uk/land-rover/injector-timing-marks.203615/post-2218866

They're all UCRs according to Trailwise - some of them might be overgrown and scratchy according to recentish comments.

No but Shropshire and Warks have some good lanes and they're only an hour or so away I'm in the Black Country now but used to live in Cambs and still do a lot of laning over that side of the country

I can't answer for the whole country but for the areas I've gone laning in, there are generally comments that are within the last 12 months - especially in the more popular areas and/or areas with active reps. I'm not familiar with laning in the Cotswolds but based on the other posts I've...

They're under Air Suspension for some reason https://parts.jaguarlandroverclassic.com/parts/index/part/id/14.55781.56176.59694/brand/land-rover/