Former public schoolgirl, 20, fell over bannister to her death after night bingeing on tequila and vodka Grace Granville fell three storeys as she went to answer door to flatmates Miss Granville worked as a booker for Storm modelling agency Inquest heard she was two and a half times the drink drive limit A former public schoolgirl fell to her death in the stairwell of a block of flats after bingeing on tequila and vodka. Grace Granville, 20, a booker for the Storm model agency, suffered fatal head injuries when she tumbled over the bannister and plunged at least three storeys when she went to open the front for her flatmates. Miss Granville, the daughter of a City fund manager, was 'extremely' drunk and two and a half times over the drink drive limit when she died, Westminster Coroners' Court heard. Grace Granville, 20, fell three storeys in the stairwell of her home in London after drinking tequilla and vodka The former pupil of exclusive St Thomas Preparatory School and Rugby School had previously suffered from bulimia and depression during her teens. But the inquest heard she was beginning to get better after finding a job as a trainee receptionist and booker at Storm, which represents Kate Moss, Cara Delevingne and Cindy Crawford. Miss Granville had been on a night out with her new boyfriend Alex Copp and other friends on March 18, this year, hours before she died. In a statement, Mr Copp said: 'At the pub, Grace had shots of tequila, a few vodka and lemonades and beer and at one point had a double shot of tequila. We continued drinking - I was drunk, we all were. We were all having a good time dancing, mucking about and drinking. 'I can't remember leaving but I left with just Grace and we went to bed at her flat. The next thing I remember is being woken up by a policeman standing over me. 'I turned to see Grace and she wasn't there.' The couple took the only key to her flat in Fulham Road, London, when they left the club. Miss Granville attended exclusive Rugby school as a border before landing a job at Storm modelling agency Residents in the block of flats reported hearing buzzing on the doors and yelling at about 4 or 5am as Miss Granville's friends tried to rouse her, before they gave up and left. Miss Granville was discovered about three hours later by an elderly neighbour who was going out to buy a newspaper. Lloyd Atkinson, in a statement, said he discovered Grace lying on the ground bleeding. She was pronounced dead from traumatic brain injury at St George's Hospital in Tooting on March 19. Dr Michael Heath, who carried out the post-mortem, said he believed it was a 'tragic accident caused by the level of alcohol' in her system. Toxicology reports showed she had 199mg of alcohol per 100ml of blood, which is at the top level of drunkenness - the next level puts someone in a coma. Recording an accidental verdict, coroner Dr Fiona Cox said she believes Miss Granville got up to let her friends in, but fell over the balcony on the stairs to her death. Grace Granville was a booker at Storm where models such as Cara Delevingne, left, and Kate Moss, right She added: 'On the night she died, she went out with her friends and really had a quite a lot to drink. At about 4/5am [after she had gone home], residents reported hearing a thud and a noise come from the basement. I believe Grace did come over the banister and fell down the stairwell based on the positioning of the body at the bottom of the stairs. At the time she did come over these stairs, she would have been extremely intoxicated. 'Grace had been somewhat disturbed by noise and went out but hadn't managed to get to the door and looked over the stairwell to see them. In her drunk state, she simply fell to her death. Dr Cox added that she wished she could impose a Rule 43, which provides coroners with the power to make reports to organisations where action should be taken to prevent future deaths in terms of excessive drinking as 'there are far too many deaths from alcohol'. Her devastated family wept as Coroner's officer Stephen Earl described the 20-year-old as 'determined, kind and generous.' He said: 'Grace was brave and determined, kind and generous. She was great company, and had a remarkable gift for friendship - the testament to this was when more than 500 people attended her funeral.