His sense of humour once extended to telling a newspaper interviewer that his parents had named him after enjoying trips to Heston Services on the M4. Now Heston Blumenthal is once again trying to associate pleasure with roadside meals, but this time the chef credited with inventing "molecular gastronomy" is serious.

The London Festival of Architecture – which began on the 20 June – will climax in a competition in which 10 of the world’s most famous buildings will be recreated in jelly.