Powerflex are a british company that specialise in making polyurethene suspension bushes, these are usually fitted in place of original rubber bushes to tighten up suspension and improve roadholding in vehicles.

I contacted them this week to enquire if they make any bushes for the front suspension of the rrs that would help with the famous knocking, they dont make any at the moment but due to the ammount of people enquiring about them they plan to start making them in the next few months.

Anyone thats interested in more technical information can find it at www.powerflex.co.uk

Did you try Polybush? They make replacement suspension bushes for all types of Land Rover 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

Polybush do make two types for the D3/RRS - comfort and hard, iirc.