Britain's Prime Minister Theresa May leaves 10 Downing Street in London, January 10, 2018 REUTERS/Peter Nicholls

LONDON (Reuters) - Prime Minister Theresa May said on Thursday she is working to secure the best trade deal with the European Union after London’s mayor warned that Britain could lose almost 500,000 jobs if it fails to agree a deal.

“The figure you referred to was his ‘no deal’ scenario. What we are doing is working for the best deal for the British people for Brexit,” May told reporters.

“We can achieve arrangements and agreements with the European Union, and I am confident that we will be able to achieve a good deal,” May said.