Based on the preview clip of the first episode of series three. Clive finally tells Martha the truth, but will they both be making a big mistake if they act on their feelings again, when they've already been torn apart by love in the past?

They had a lot in common: both thought of Hogwarts as home, both would die before they'd let anything happen to Harry, both were in far too deep to back out now. They shared a love of lemon drizzle cake as well, of course. What if, against all the odds, Dumbledore and McGonagall fell in love?