SALT limits and Royal Navy force structure

What might Britain have had to give up if it had remained part of the SALT negotiations near the end of the Cold War?

Probably little directly, although treaty proportionality might indirectly have forced the Royal Navy to maintain a more balanced fleet.

Britain had little directly relevant to surrender in the negotiations. Staying inside a treaty framework might still have helped the Royal Navy by imposing proportional force requirements. Those external limits could have restrained the sharpest cuts or imbalances in British fleet composition. The counterfactual treats arms control as a possible source of force-structure discipline as well as disarmament.