Iran on Saturday again called in the British ambassador, marking the 15th time in less than three months a foreign envoy has been summoned, as protests shake the country.
The foreign ministry called in British ambassador Simon Shercliff, a day after his German counterpart, Hans-Udo Muzel, had to appear, state news agency IRNA said.
"This is a reaction of Iranian diplomacy to unprecedented pressure against Iran," IRNA said.
Shercliff has now been summoned five times since the start of demonstrations sparked by the death of Kurdish-Iranian woman Mahsa Amini, 22.
Amini died in custody on September 16 after her arrest by the morality police in Tehran for allegedly violating the country's strict dress code for women.
IRNA said the foreign ministry protested the United Kingdom's support for "terror and unrest", and sanctions it has imposed.
Iran on Saturday also condemned Australia for imposing new sanctions against individuals and institutions allegedly involved in Tehran's response to the protests.