When cruising down the motorway at around 80 mph, or more, every once in a while it just loses power and acts like it's being starved of something, but if I keep my foot on the pedal, while maxed at about 50 mph on low revs, it eventually gets its act together again and is fine so long as I keep to about 70 mph. It only ever happens on deceleration from around 80 mph, or a little more, in motorway conditions. If you stick to 70 mph it never happens. Almost feels like momentarily running out of fuel. Throws no codes. Apart from this, everything is running great. Anybody experienced this and found a cure?

Keep it to 70 (the speed limit, after all...).😏 2012 (L322) 4.4TDV8 Vogue SE, RSE, Fuji White over Arabica.
Previous V8s: BMW 645Ci, P38 4.6, P38 4.0, Merc CL500
Previous others: Honda x1, Volvo x7, Rover x6, BMW x6, Ford x1, Mercedes x2, Skoda x3, VW x2, Renault x2, Citroen x1, Mazda x3, Nissan x1, Audi x3, Kia x1, Fiat x4, Subaru x3, Austin x2, Triumph x2, Jeep x2, Hyundai x2, Lexus x1, Mitsubishi x1, Saab x2... and some others I've forgotten!

Needs diagnostic codes reading via a plug in. Could be the well known hiccup which requires a software update.
Take it to a decent independent specialist who has access to full LR software etc. 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
I use www.glenrands.co.uk Great independent specialist!
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Good advice - thank you!