Ross Kemp has revealed how Alzheimer’s disease has left his former EastEnders co-star, Barbara Windsor unable to recognise him.Kemp starred alongside 82-year-old Windsor as they played mother and son Peggy and Grant Mitchell on the BBC One soap for over 20 years.Still close friends, the 55-year-old has spoken candidly about how Windsor’s Alzheimer’s diagnosis six years ago has changed the star as part of his latest documentary series Ross Kemp: Living With Dementia.“Barbara was my 'TV mum' on