WASHINGTON, May 8 (Reuters) - The United States and the

United Kingdom have more serious work to do on liberalizing

trade, a British official said on Thursday, after the two allies

announced a limited bilateral trade deal that leaves in place

U.S. President Donald Trump's 10% tariffs on British exports.

The official told reporters that the United States had also

pushed for a restructuring of Britain's digital services tax,

but that was not agreed to in the trade deal. The official said

that Washington could revisit the issue, but there was no agreed

process for doing so.

"This is not a finished, classic 'bells and whistles' free

trade agreement. It started off as a tactical response to

President Trump's tariffs, but actually morphed into a more

substantive trade deal," the official said. "And it will be

built on. ... We've done the Oval Office, now we've got more

serious work to do."