The Doctor's name was Mr. Morrison-Ely, he wasn't referred to as doctor. He advised them against travelling for a few days. Oliver decided he would go back to London, pay the bill, and bring his father his old slippers and razors. Mario decided to go with him, and Oliver gave him the task of paying for everything with his money since the money was foreign to him and he knew it would make Oliver feel as though he helped his elder cousin.