While your on the topic of Nuclear weapons why don't you give some consideraion to countries who remain neutral, The UK has sufficient energy resources to survive without nuclear power. If a terrorist attack was targeted at sellafield other countries would suffer to, how would the British government feel if the constructed a nuke plant in central London?
The only analogy I can make to your comments on Britain threatening the Middle East with nukes is:
Police in US carries 9mm Glocks, so in turn the average crook needs to carry Glock or better, the same applies with nukes.
No one likes to feel at a disadvantage so if you make vailed threats against the middle east of course they are going to acquire something to equal it, it's human nature.