This episode Heston puts the fun back into pub grub, building a giant, edible pie and turning it into a fully functioning public house. He also makes a billiard table from cod, tartare sauce and pea mousse with pickled egg billiard balls. With pubs appearing to be in decline, with around 18 locals a week shutting their doors for good, Heston is on a mission to put the fun back into pub life.
In tonight's finale, Heston Blumenthal tackles the challenge of making the ultimate Christmas dinner. In the grownup world, Christmas has lost some of its wonder. But Heston wants to change that and plans to create a supersized festive food adventure, to be enjoyed by people who normally have to work on Christmas Day.
Motorbike racer Guy Martin is in the USA, hoping to smash the motorbike record at one of America's oldest races - the Pike's Peak International Hill Climb. The annual contest, known as 'The Race to the Clouds', sees riders compete against the clock on a gruelling mountainside track that finishes at over 4,000m above sea level.
Seven of the UK's leading engineers, designers and computer programmers put their skills together to try and help four people with very different needs. Mum of two Shamreen who has very limited vision needs something that will help her and her two young sons get around. Seven year old Rosie who had brain surgery as a baby and now wears a cumbersome medical helmet, hopes the team can make her a less visible helmet that will help her fit in with her friends and the team are challenged with coming up with a solution to help two teenage brothers with cystic fibrosis.