What do we do differently if we have a nuclear capability?
Nothing. But if we don't have it, then there is no level playing field and Iran has one up on us before we even start. As I said, they can then make demands that we have no choice but to submit to.
To give you some background on myself, I did my masters thesis on the politics of nuclear warfare.
This doesn't make you right, but surly it should give you a good understanding of the importance of the UK nuclear deterrent?