The film was directed by Gerald Thomas, and stars Michael Craig, Anne Helm, Jeff Donnell and Alan Hale Jr.

His boss, Sir Giles Thompson, is eager to sell a new supersonic jet aircraft (which Jack has designed) to American millionaire airline owner, Paul Fisher, who has come to England with his wife and daughter Kathy.

Fisher asks Jack to take Kathy to see some friends (her hire car broke down before she got it) while he looks at a rival aircraft built by Lord Upshott.

Sir Giles invites the Fishers to the Ascot Racecourse but again they have problems, coming across a broken-down traction engine called "Princess Caroline".

It is a long trip to Woburn and they have to stop a number of times, including overnight where they camp next to the engine.

After an eventful journey, Fisher and Jack finally reach Woburn Abbey and enter the rally, which includes almost every English traction engine of the period, around 100 in total.

A Handley Page Victor military bomber is featured in the film as Hopkins' supersonic jetliner.

A number of sequences show a Victor in close-up, taxiing, taking off, climbing, flying past and landing with drogue parachute deployed.

The traction engine that featured as The Iron Maiden was a John Fowler & Co. 7 nhp showman's road locomotive (works no.

She was built in September 1920 as a class R3 road locomotive for heavy haulage work and saw many years' service on the Isle of Portland, hauling blocks of stone from the quarries to the harbour.

[4] She returned to Fowler's works for conversion into a showman's engine, which entailed the addition of a dynamo bracket in front of the chimney, and a full-length canopy, among other things.

The engine was featured on the cover of the Official Programme for the 38th Great Dorset Steam Fair, in 2006, and continues to make regular appearances at that event.

It has also made at least one appearance at the Yorkshire Air Museum at Elvington near York to be photographed next to the Handley Page Victor belonging to Andre Tempest that is preserved there.