Israeli Ambassador to the UK Ron Prosor expressed sorrow on Tuesday over a British decision to expel an official working at Israel's embassy in London.British Foreign Minister David Miliband on Tuesday announced the decision was reached after a probe linked Israel to the forgery of UK passports used in a suspected Mossad operation in Dubai to assassinate Hamas commander Mahmoud al-Mabhouh."The ties with Britain are important and we regret the decision," Prosor said in a statement reported on Sky news.