[billy123]

Somebody has to take the first step.
Nobody in possession of nuclear weapons is in any position to tell anybody to stop developing their nuclear capabilities.
What right have Britain,America or anybody to throw their arms up in the air in disgust at Iran,North Korea or anybody for that matter for developing nuclear capabilities when we are in possession of enough to wipe any country off the face of the planet.

Keep them and deal with the fact that everybody has the right to own them or get rid of them and gain the right to try and stop the development and ownership of them by anyone.
There are a lot better minds than mine trying to answer the question keep or get rid but it doesn't take a genius to work out that unless somebody makes a brave first move to disarm then nobody will.
I personally hope Britain can disarm and lead the way forward.