The room that caught fire. (Express Photo) Gaurav Kumar, a tour and travel startup founder, had landed in Delhi from London on May 26 with grand plans to celebrate his father Dhanendra Kumar’s birthday — first at the Delhi Gymkhana Club on May 30 and then a bigger one in London on June 6, when the retired IAS officer, who served as Executive Director at the World Bank and became the first Chairman of the Competition Commission of India, turned 80. Flight tickets had already been booked for Gaurav and his parents’ journey on June 3. But fate had other plans. Late Tuesday, Dhanendra breathed his last at AIIMS Trauma Centre, after inhaling poisonous smoke from a fire suspected to have been triggered by an explosion in an air conditioner at his three-floor house in Hauz Khas’s R block. The AC, 12 years old, was serviced a week before Gaurav came home, said police. Gaurav, meanwhile, remains admitted to the hospital.…