GENEVA, April 23 (Reuters) - Iran may be interested in joining a key nuclear treaty if the United States withdraws its threat to rip up an existing deal on Tehran's nuclear ambitions, the head of the CTBTO nuclear watchdog said on Monday.

LONDON, April 23 (Reuters) - The UK's top share index rose on Monday as a rise in bond yields buoyed financials and an appetite for risk returned at the beginning of a busy week of company updates.

LONDON (Reuters) - Britain will compensate some Caribbean immigrants who arrived in Britain in the decades after World War Two, after they and their children were recently wrongly labeled as illegal immigrants, interior minister Amber Rudd said on Monday.

LONDON (Reuters) - Introduced to provide help for under pressure referees, the role of Video Assistant Referees (VAR) still remains unclear after more questions over consistency arose at Wembley on Sunday.

WASHINGTON/TORONTO (Reuters) - Western allies stepped up pressure on U.S. President Donald Trump on Monday to keep alive an international nuclear deal with Iran, with French President Emmanuel Macron due to urge him in person not to tear up the 2015 agreement.

LONDON, April 23 (Thomson Reuters Foundation) - Luxury fashion houses Dior, Chanel and Dolce & Gabbana are among the least transparent of the major retailers when it comes to providing information about their supply chains, according to an index ranking commitments to tackle slavery and forced labor.

April 23 - *Graphics Desk

LONDON, April 23 (Reuters) - Britain's Prince William brought his children, Prince George and Princess Charlotte, to the hospital in London to see his newborn son on Monday.

TORONTO, April 23 (Reuters) - Foreign ministers from the Group of Seven leading industrialized nations will create a working group to study Russia's "malign behavior" because of concerns about Moscow's actions, British Foreign Secretary Boris Johnson said on Monday.