Tina Baker is chatting ten to the dozen, as full of sharp observations as she is jokes and anecdotes. Formerly a TV critic on TV:AM, then soap expert on GMTV, she is a fitness instructor these days, but has recently added another feather to her bow – published author. Call Me Mummy is a twisty, heartbreaking thriller about a demonised council estate mum, Kim, whose stroppy five-year-old child, Tonya, goes missing, and the damaged ‘Mummy’, who snatches her and tries to mould her into the perfect child. Tina, who is originally from Coalville in Leicestershire, lives in North London with her husband, Geoff, and their four rescue cats. She discusses married life, the pain of never having kids and, discovering with her searing debut, that despite loving to find the humour…