Gail Porter smiles happily as she says she is delighted to be back in Scotland and insists she is enjoying the happiest days of her life.The TV presenter is dressed down in comfy dungarees and trainers, make-up free and, of course, instantly recognisable by her bald head.After decades of well-documented struggles with her mental health, relationships and finances, she seems wiser, calmer and finally at peace.She puts it all down to daily exercise – a combination of yoga, running and cycling.Now, the Women’s Tour of Scotland has announced the Scottish celebrity as an ambassador for their inaugural race, which takes place between August 9 and 11.While pro cyclists such as Katie Archibald will represent the elite competitors, Gail, 48, wants