Britain has had diplomatic contact with the Hayat Tahrir al-Sham (HTS) group that swept Syrian President Bashar al-Assad from power last week, British foreign minister David Lammy said on Sunday.
"HTS remains a proscribed organization, but we can have diplomatic contact and so we do have diplomatic contact as you would expect," Lammy told broadcasters.
"Using all the channels that we have available, and those are diplomatic and, of course, intelligence-led channels, we seek to deal with HTS where we have to."
On Saturday, US Secretary of State Antony Blinken said the United States has had direct contact with HTS.
Also Sunday, Britain announced a 50 million pounds ($63 million) aid package to help vulnerable Syrians.
Millions of Syrians need humanitarian assistance after more than a decade of civil war that shattered much of the country's infrastructure and displaced large numbers of people. Some of the many who fled the country are returning from neighboring states.