0631 GMT April 21, 2019
Macaire made the remarks on Wednesday in a video message released on his official Twitter account when he extended his congratulations to the Iranian nation on New Year.
Friends and relatives gather together to celebrate the New Year and the beginning of spring, he said in the message, IRNA reported.
He stressed that the British diplomatic mission in Iran will take advantage of any opportunity to improve ties between two countries through honest negotiations and mutual respect.
He also offered his best wishes for all those celebrating Nowruz in the world.
Nowruz (meaning new day in Persian) marks the first day of spring.
The Persian New Year is celebrated across the world by various countries, particularly Afghanistan, Albania, Azerbaijan, countries falling within the Former Yugoslavia, Republic of Macedonia, India, Iran, Kazakhstan, Kyrgyzstan, Tajikistan, Turkey and Turkmenistan.
It was registered as an Intangible Cultural Heritage of Humanity in 2009 by the UN.