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It's been tipping over for 800 years - what's the gravity-defying magic behind Pisa's leaning tower? And, how are chocolate digestive biscuits manufactured?

How did the ancient Greeks invent parchment with techniques still used today? And how do they make shuttlecocks, the fasting moving object in sport?

Messerschmitt KR200. This iconic three wheeler is about to celebrate its 60th birthday so the boys spy a chance to take advantage. But can the duo sell this car for mega money?

Citroen HY Van. Mike goes to France in search of a retro-cool Citroen HY Van. Edd isn't impressed with his spoils, knowing it will be a costly renovation. But can they find a buyer?

In Sussex, Henry and Simon meet a couple with a penchant for Star Wars collectables - and motorbikes! They unearth items including a 17th century bench seat.

Follow the amazing manufacturing processes behind crosscut saws, haggis and collectible firearms.

Follow the amazing manufacturing processes behind alligator bags, lockers, bench planes and deployable flight recorders.

Teleshopping.

Teleshopping.

A 30-truck charity hay convoy delivers supplies to drought-stricken King Island. Rookie Harrison Hooper tackles his toughest challenge yet.

Mike and Vinnie Elliott embark on a risky cash run to salvage cars. Lyle Lucas delivers vital supplies to the remote Oak Valley community.

1976 Mercury Capri Mk2. Mike finds a rare beast: a 1976 Mercury Capri MK2 with the classic 2.8 litre V6. However, it's not without its problems, which means a lot of work for Ant.

Renault Alpine. Mike is in France to hunt down the rare Renault Alpine 310. The car he finds is great, but it has some surprises in store, and Edd is charged with getting it fixed.

1969 Opel GT 1900. Mike and Ant dive into the European sports car market with a 1969 Opel GT. It suffers fresh body damage, a backfiring engine, shoddy brakes, and faulty headlights.

Golf - Part 1. In homage to some auto icons, Mike Brewer and Edd China embark on getting a second hand classic Mark 1 Golf GTI 1.8, back into road-ready condition.

Golf - Part 2. Auto expert Mike Brewer and mechanic Edd China are fixing up a second-hand classic Mark 1 Golf GTI 1.8. Can they transform it from a glum Golf into a glistening GTI?

Ford Focus ST. With the Ford Focus having its 25th anniversary, Mike thinks the ST model may be the next classic. He nabs a bargain, but Elvis finds the engine needs a full rebuild.

The British Are Leaving. Mike and Ant look back on their American adventure. Before they return home to the UK, they pack up the workshop and sort through the work of half a decade.

VW T2 Panel Van. Mike hunts out a classic camper but impossibly high prices force him to settle for a less popular panel model. Can Edd realise the ambitious plans for its upgrade?

Penny For Your Thoughts. Back in Northern Ireland, Henry and Sam discover some lovely vintage cars as well as some modern motors. What will they take home?

Henry and Sam are in the Cotswolds to visit the largest sidecar manufacturer in Britain. They uncover a rusty Lancia Aurelia and a Royal Enfield 500.

In Somerset, Sam and Henry meet a man who's been collecting cars since 1963. The guys are excited to uncover an Austin 7 and a De Dion-Bouton.

Sam and Henry visit one of Britain's biggest dealers in second-hand milk floats. This quirky collection features a beautiful 1959 Chevrolet El Camino.

Sam and Henry look through an eclectic collection in Hertfordshire. There's lots for the guys to admire, including a Humber Sceptre and a model aircraft.

Henry and Sam are in Oxfordshire to rummage through a collection of vintage tractors and automobiles. They find a Suzuki SB200 and paraffin dispenser.

BMW 323i. Paul and Drew check out a BMW 323i that's been sitting in a barn for 12 years. Drew wants to give the car a tasteful revamp, but Paul has a flashier plan.

Datsun 280Z. The restoration of a rare Japanese icon is a chance for Drew to pay homage to one of his automotive heroes. But work stalls when Paul struggles to find essential parts.

David Kingerley. Henry and Fuzz visit David's Derbyshire shed, a treasure trove of vintage mechanical gems, and uncover a wonderful Monet-Goyon motorbike.

Richard Gaunt. Henry and Fuzz visit Richard's Staffordshire shed, uncovering an Excelsior and Mobylette as they dive into a treasure trove of two-wheeled gems.

Cinema Seat. James, Sim and Tony reinvent cinema seating, attempt to stop cereal going soggy and repair a telescope. They also have an idea for beauty treatments.

Around the world, there are extraordinary building mistakes. Design teams and experts analyse what went wrong and how engineers are fixing them.

Heart Of (Darwin) Glass. The Rubyvale Boys help a neighbour in need for a cut of the sapphire spoils. Tom heads to the Tasmanian mountains in search of meteorite-impact glass.