We are only trying to punch above our weight because we have a seat at the Security Council. The bunch of 5 nations, the USA, China, Russia,France and ourselves is now totally discredited now that Pakistan, India,North Korea, South Africa and Israel, not forgetting Iran have joined the nuclear club.
Blair signed up to the new Trident for obvious reasons but as we don't operate independently from the US why be just a sub-station.
The strength of a nation is not how much bigger your rocket penis is but the wealth of the country that gives its true influence. We are nearer the bottom of the pile.