The UK is ARRC's Framework Nation and provides the peacetime HQ working environment, the majority of staff, communications and life-support when deployed and the strategic and operational movement organisation.
Just under 60% (272) of the peacetime staff of HQ ARRC are from the UK and the UK's 2 combat divisions: 1(UK) Armoured Division and 3(UK) Division are assigned. The UK also affiliates the majority of the ARRC's combat support and combat service support units. Some of these are shown below:
- 16 Air Assault Brigade
- 1 Signal Brigade
- Joint NBC Regiment
- 1 Military Intelligence Battalion