Foreign Secretary William Hague said Iran should "be more realistic about what is necessary" to reach a nuclear deal with major powers.
Hague made the comments shortly after a meeting with US Secretary of State John Kerry in Vienna.
They were joined in the Austrian city by their French and German counterparts for talks about Iran's nuclear programme.
Six months ago, a deadline to reach an agreement was set for July 20.
More top news
A baby who was unable to tell which of two identical twin brothers was his father has been watched millions of times online.
Ewan Williamson,14, died from heatstroke in Australia after police took almost an hour to respond to his distress call, an inquest heard.
Explosives and suicide vests have been seized from a group of suspects stopped on Turkey's border with Syria, the Turkish army has said.