I just looked up a flight for a date close to when I wanted to leave and gave them that. They didn’t ask for confirmation. However if you want to be super safe for $15 you can get a temporary flight number which holds up under scrutiny from onwardflights.com
Screenshots are not allowed. You need an official bank statement with your address. Most banks let you download this as a pdf from your online banking.
they did not ask for proof of accommodation or flights. I just entered the details of a hotel I found online and the same with the flights.
If you want peace of mind while applying- choose a cheap hotel so you can make a booking there if they ask for this (I don’t think they will, no one I know on here has been asked by the London embassy to my knowledge)
you’re welcome- good luck with your application. Also just to be clear, my experience was with the workcation dtv and I work for a company. If you are self employed, I hear they often ask for tax returns too, but not in my case.