A mum has created her own Christmas advert and made her son the star of the show.Toddler Lincoln Norris has captured hearts after appearing in the festive ad, pretending to work in their family shop.And proud mum Lisa Norris, 29, says it could rival the famous John Lewis Christmas advert – despite creating the video on her iPad for less than £25.The 90 second video, filmed at the Ayton Mini Market, in Ayton, Scottish Borders, sees two-year-old Lincoln hard at work in the store, scanning