Wikipedia Page - Bella in the Wych Elm
I had a quick glance and corrected a few of the most obvious ones. Jack Mossop was NOT Una's cousin. He was her ex-husband.
It is unfortunate that most of the articles used as references for the Wikipedia article on Bella simply rehash old rumours and other articles. All that does is compound the errors. I recently read a news article which suggested that Jack Mossop and the mysterious Van Raalte had been trying to prevent Bella from drink-driving. Original source material is where we might find some new answers... not creating fresh rumours.