Angel Delight is a powdered custard dessert product produced in the United Kingdom. It is designed to be mixed and whisked with milk to create amousse-like custardy sweet dessert.

Angel Delight was launched in 1967 by the Bird’s company with a strawberries and cream flavour and by the 1970s had doubled the market for instant desserts. After a lull in popularity during the 1980s, a revival campaign was run in 1999, featuring Wallace & Gromit. In 2006 the brand was the best-selling line in the UK instant cold desserts sector

Info gleaned from Wikipedia