To effectively infiltrate the British workplace in 2021, demons should mimic the local human population by wearing Christmas themed pyjama bottoms, fluffy socks, a suit jacket and a mask worn underneath the chin. The mask seems to be intended to warm the chin although occasionally the humans will use it to cover their mouth, and sometimes on rare occasions even their nose. Conceal your animal form (in this case a bat) by wearing a stylish wig on top of it, but ensure it is not too well-groomed. A smart pair of glasses help to add an air of professionalism to complete the look.