Theresa May has rejected claims she does not believe in Brexit - and insisted she would make a success of it "regardless of the outcome" of talks.

She told the BBC's Andrew Marr Show her plan for post-Brexit trade with the EU was not dead, despite it having been rejected by EU leaders.

And she urged the Tory party - in Birmingham for their annual conference - to "come together" and back it.

Boris Johnson has called her so-called Chequers plan "deranged".

In his latest broadside against her Brexit strategy, the former foreign secretary suggested he might be able to strike a better deal than her with Brussels.

He told the Sunday Times : "Unlike the prime minister, I fought for this, I believe in it, I think it's the right thing for our country and I think that what is happening now is, alas, not what people were promised in 2016."

Mr Johnson also set out domestic policy ideas, including building a bridge between Britain and Ireland and putting the HS2 scheme on hold to focus on a rail link in northern England.

Mrs May, who campaigned for Remain in the 2016 EU referendum, hit back at Mr Johnson in her Andrew Marr interview.

She said: "I do believe in Brexit. Crucially, I believe in delivering Brexit in a way that respects the vote and delivers on the vote of the British people while also protecting our union, protecting jobs and ensuring we make a success of Brexit for the future.

"That's why I want us to get a really good free trade deal with the European Union, which is what lies at the heart of the Chequers plan."

But she also said she was prepared for a "no deal" scenario, saying: "We will make a success of Brexit, regardless of the outcome of the negotiations."