Please have the question solved with relevant case laws

Rentavehicle is a large taxi hire firm with a broad-based clientele, including business customers. The Managing Director (Gillian) has consulted you over two recent incidents. First, one of the taxi drivers (Nicholas) allowed a driver from another taxi firm to use his (Nicholas's) taxi between 6pm and 12pm on a Friday night. During that period, a young woman (Pamela) who was picked up in Nicholas's taxi suffered a serious sexual assault. The perpetrator of the assault has been identified as the person to whom Nicholas loaned the taxi. His name was Mitchell and he has since been arrested. The second incident concerned a longstanding business client (Troy) was driven to the airport by one of the drivers (Helen). During the drive, Troy asked Helen whether she LA3001 Law of tort could stop the taxi outside a restaurant and purchase a takeaway hot meal for him. Troy told Helen that he was allergic to nuts and that, on no account could the meal contain nuts. Helen was anxious to help Troy because he brought a lot of business to the taxi firm but she was also concerned that she was illegally parked. Helen completely forgot to inform the waiter of Troy's nut allergy. The meal did contain nuts and Troy suffered a severe allergic reaction and died