Oh, for fuck's sake.
I just posted "I will never believe you in future" on another thread, open this one next, and you are writing any old shit that you believe to be true.
Some facts:
Yes, Brian's daughter singing WWTLF was released. It was recorded as a demo in advance of two other children recording it for a charity single. The demo was included on the 12" single. The single had a video for it. There is no video footage of Brian's daughter singing it.