I used to love this Rennet and Milk based dessert as a kid: Junket.
It used to be pretty easy to find in Australia in the 1980s but where can I buy some in London UK?
"Junket is a milk-based dessert, made with sweetened milk and rennet, the digestive enzyme which curdles milk. It might best be described as a custard or a very soft, sweetened cheese.
...in England where, in medieval times, junket had been a food of the nobility made with cream, not milk, and flavored with rosewater and spices as well as sugar. It started to fall from favour during the Tudor era, being replaced by syllabubs on fashionable banqueting tables and, by the 18th century, had become an everyday food sold in the streets. By the mid-20th century it was little eaten except by convalescing children and in south-western England."