Spain has said an EU summit on Brexit this weekend could be called off unless an agreement is reached with the UK over Gibraltar.
Prime Minister Theresa May has accepted the BBC's offer but Labour would prefer ITV.
Theresa May has written a letter to the nation setting out her intention to make the UK's exit from the EU work for both Leave and Remain supporters, as EU leaders gather to formally approve the PM's Brexit plan.
Theresa May appears to have secured her immediate survival in 10 Downing Street as a rebellion against her leadership stalls.