Introduced this year by Heinz Wolff Caged
Se walls do not a prison make', one also needs a lock. The challenge for our three teams is to design and build a combination lock that will defy their opponents picking abilities.
Three totally different devices emerge-each works beautifully.
So if you ever wondered how a combination lock works, or just wish to be captivated, this is the programme for you.
Guest judge Victor Liardet Assistant producer MAX WHITBY Producer CHARLES HUFF