The current BBC News headline is:
LIVE US vote goes to wire as Trump falsely claims fraud
The URL above is just the standard https://www.bbc.co.uk/news. The content to which it links will change. I have tried to insert a screenshot of the current headline below. I am very tired. My apologies if I have got it wrong:
How does the BBC know Trump’s claim is false? Has it carried out an investigation?
Not that I deny that the BBC has longstanding expertise when it comes to matters of fraud: