I know of the armoured version of the D4, which would presumably have heavier duty control arms, but not heard of anyone fitting them to a standard D4.
Have you considered protection plates?
APT Front Lower Control Arm Guard | Discovery 3 and 4
Edit - scratch that, talking upper vs lower arms.
2010 TDV6 3.0L Discovery 4 SE remapped to RRS output, Alaska White, GME XRS-330c, IIDTool BT, Dual Battery, Apple CarPlay, OEM Retrofitted: Cornering lights, Door card lights, Power + Heated Seats, Logic 7 audio
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