My friend Diana Joll, who has died aged 92, had a successful career in social work, beginning in 1949 as house mother in a children’s home and ending in 1987 as a senior psychiatric social worker for Brighton and Hove council. In parallel, she developed a passion for the art of the silhouette, collecting more than 700 works and achieving national recognition for her expertise in the subject. Diana was strongly influenced by her father, Teddy Joll, an artistically minded…