Downing Street insisted it would not be swayed by "stage managed" TV images today as Iran aired more footage of the captured British military personnel.
Tony Blair’s official spokesman said Tehran knew the Government’s position, and that the UK had "strong international support".
Diplomats were now waiting for the Iranians’ next move after responding to an initial note delivered to the British embassy, he added. The spokesman said: "The Iranians know our position. They know that stage managed TV appearances aren’t going to affect our position."
"People know clearly what our position is and whatever you see on your TV screens is not going to affect that."
The fresh images broadcast on Iranian state TV show several more of the captives standing in front of maps. Some of them are also seen smiling, and admitting that they had strayed into Iranian waters - which is flatly denied by the UK Government.
The footage cuts quickly between several of the men, and they are not heard saying anything. State-run radio reported that further personal confessions by the servicemen are not being broadcast because of "positive changes" in Britain’s stance.
However, Iran claimed earlier that all 15 British service personnel had confessed to illegally entering the country’s waters.
A Foreign Office spokesman stressed that the men had been detained against their will, and were being refused consular access.
"We have made it quite clear they were seized in Iraqi waters, and we want them released," he added.
The Prime Minister’s spokesman said there was "a lot going on behind the scenes", and the current public holiday season in Iran was "inevitably impacting a bit" on the process.