Letter in The Guardian:

To the north of Iran lies Russia, an expansionist nuclear state that has invaded Muslim Chechnya. To the west is Iraq which invaded Iran in the 1980s and is now occupied by two nuclear-armed powers, Britain and the US. Also to the west lies Israel, another nuclear power. Although President Ahmadinejad's latest statement makes it clear that his country has no desire to develop nuclear weapons, the case for Iran to have an independent nuclear deterrent is far stronger than that for the possession of nuclear weapons by the UK.
Yusuf Rakeem
Bristol