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Isn’t the submarine fleet the main platform for the nuclear deterrent?
It’s the only platform, the RAF haven’t had buckets of instant sunshine to deliver since the late 90s.
There’s 4 of them, and I doubt they’ve remodelled the interiors to hold an extra 20 nukes a piece.
Each Vanguard has the capacity to hold 16 Trident missiles armed with up to 8 warheads each = 128. In practice, they only sail with 8 missiles and 40 warheads, so there’s plenty of scope to fill them up if, for some mad reason, you thought that was a good idea. The successor Dreadnought subs will only have room for 12 Tridents, so it looks like the plan is indeed to load them up with more warheads per missile.
In theory, so that we can spread them around a bit, and actually get to use them once the bombs start flying, rather than the whole stockpile being destroyed in a first strike.
Assuming we're not already glowing silhouettes by then anyway.