Britain can send the SAS behind the enemy lines to sabotage the Iranian facilities. It's tricky and expensive to redo all that - Saddam found it tough once the Israelis took out his reactor.
Sure Israel knocked out Saddam's reactor, but that was overt, kickass, in your face, use of open military force, by a country that knew that it would exist no longer than the time it took Saddam to develop those bombs.
Sending SpecOps deep into Iran to damage a very heavily guarded installation, in a very alert country, sounds like a fairy tale.
Now if you were to suggest that England has the assets to openly bomb that reactor out of existence, and the stones to use them, then you will get my attention.
I don't think for a moment that anyone in this administration thinks that the EU proposals will go far.
And then we will see what happens.
As for the other posters that believe that Iran is about to undergo a popular rebellion, please do not hold your breath. It's a nice thing to want to believe.
Isn't going to happen.