By Olivia Wheeler Coronation Street fans are convinced they’ve rumbled newcomer Demi’s real identity. Soap fans will recall that Steve McDonald’s estranged wife Tracy Barlow appeared to exit the cobbles last month as she was seen saying her goodbyes to her relatives including dad Ken Barlow and daughter Amy Barlow. Having leaving drinks at The Rovers, she then hugged it out with her nearest and dearest and left the cobbles to start a new life with lover Tommy Orpington in Spain, seemingly for good. On the cobbles this week, Steve has been attempting to date again but with disastrous results. E…