Dunno 'bout that 'Sven'. Unless my memory serves me ill, the Staffordshire Regiment were sent to the first Gulf War under the threat of disbandment.
Military requirements will have NOTHING to do with the retention or otherwise of the Brigade of Gurkhas. The decision will be taken by a civilian 'bean-counter' (either civil servant or 'special advisor'), employed in the Branch Office of No. 10 Downing Street, which is commonly referred to as The Treasury.