Relations between Iran the UK have slumped recently. They may never have been what you could call buoyant but they are now worse than ever. Iran has faced condemnation from many countries, including the UK, after its ongoing nuclear development program seemed to be ominous. Iran continued to maintain that the program was to develop nuclear power not weapons but most countries did not believe this in the least.
The BBC reported that, "On Sunday, Iran's parliament voted by a large majority to downgrade diplomatic relations with the UK after the UK Treasury imposed sanctions on Iranian banks the previous week, accusing them of facilitating the country's nuclear programme"
Updates to follow