If you have the old style connectors then replace them as they will fail at some point. Either buy the updated ones or just cut some silicone reinforced hose up for a good as fix but way cheaper. If the throttle elbow seal is not leaking just leave it IMO but keep an eye on it. Clean the map sensor every oil service. The soot / oil gunk builds up no matter how you drive as the EGR valve is open most of the time and the turbo leaks oil ( they all do) but if you change the oil more regularly than the official intervals it will have less soot in it to add to the gunk load. 2012 TDV8 Vogue (L322)

Thanks JG - I’ve added the photos to the original post. Elbow looking particularly yummy I think you’ll agree…

Swap out the 4 hoses for silicone ones. Loads of threads on this. Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
2025MY Defender D350 90 in Silicon Silver on coils
1974 Series 3 Lightweight = "Millie"
Many, many other Landies over the years
My preferred specialist: www.glenrands.co.uk
--------------------------------------------------

Unnecessary quote removed

Replace the old 4x hoses with a length of 70mm internal diameter - silicone or rubber. You've got the old type so need jubilee clips too. Cut the sizes you need off the length of hose. The genuine parts would cost about £130 for all 4, when all they are is a length of rubber hose anyway so, just purchase a length and cut what you need.

The plastic intake pipe to the throttle body, take it off and check for a collapsed seal. Here's one with the highlighted areas showing where the seal has collapsed:

Click image to enlarge

Well, after a bit more digging, I found the throttle body gunk was simply due to the plastic flange not being properly seated on the throttle body itself. After careful removal and cleaning of the whole assembly, it’s all back together and thanks to a length of ultra-fancy high-temp silicone sealing tape, the whole thing is a tight as a badger’s and there are no more audible air intake leaks.

The difference in noise levels around the intake is incredible and the fatty is much more direct on the throttle. Funny no codes were thrown…

Next up - donut hoses.

I’ve recently done the lot on mine - throttle body was hard to come by, I also cleaned a load of gunk out of the donut and various connections.

The car does feel much crisper under acceleration but I won’t know if it’s fixed my intermittent restricted performance issue until it doesn’t happen.

None of it’s too hard, just a bit fiddly here and there but the guides in the wiki will see you right and it is kind of satisfying to know that it’s all clean in there - for a while anyway.