Chevaline redux? Desire for national strategic capability has U.K. seeking Trident follow-on input

The UK and the US are exploring British ambitions to provide greater technical input into the nonnuclear payload and systems of any Trident-based successor to the country's nuclear deterrent, which continues to be based on a submarine-launched ballistic missile. The UK is studying more involvement with the US that might cover passive and active countermeasures payloads, including penetration aids and greater access to guidance technology, but the government is yet to make a final decision on a Trident replacement.