The long term viability of the UK nukes does rather depend on support from the US though - they use our own fissile material, but the warhead designs are believ

The long term viability of the UK nukes does rather depend on support from the US though - they use our own fissile material, but the warhead designs are believed to largely be based on the US W76 and the actual Trident missiles come from a pool controlled by the US.