Article in The Sunday Times this morning. It appears the research has eventually been commissioned but no indication of how long it will take or when we can expect to seeing the findings published.
www.thetimes.co.uk/article/b3fd2a9c-a01a-11e9-89f7-56552ee52d6f
Sorry I don't have a share token, I read it as c+p on another website and I don't know if I'm allowed to link to it here.