a 1974 commercial directed by a young Ridley Scott for the (short-lived) Amazin' Raisin chocolate bar, and has remained popular with reenactors ever since. Waller assisted Hardy during the writing of his authoritative 1976 book Longbow: A Social and Military History (which was used as basis for a BBC TV documentary). This included taking part in the first scientific ballistic trials (at the Royal Armaments Research and Development Establishment) of the English longbow. In 1977, the Royal Armouries (then based only in the Tower of London) had the idea of making a short film, How a Man Schall be Armyd, which would show a knight being equipped with plate armour, mounting a horse and riding off. The armour would be from their own collection, made in the Royal Workshops at Greenwich during the reign of Queen Elizabeth I (). They needed someone who could wear armour and ride in it, look natural while doing so, and be trusted with a historical relic. They knew exactly the man to ask, and Waller accepted their invitation; so beginning a long association. The film was shot at Bodiam Castle in Kent, and the Armouries were still showing it. The Tower could only display a small fraction of the Armouries' collection. They had an idea of moving the bulk of the arms and armour collection to a purpose-built facility. That came to fruition in 1996, when, under the direction of Guy Wilson (Master of the Armouries 1988-2002), the Royal Armouries Museum was opened in Leeds. Wilson and Waller had been good friends since before the planning stage, and the new museum incorporated many of Waller's ideas for demonstration areas, where visitors could see craftsmen at work or watch displays of martial prowess. In 1994, after the project has been given the go-ahead, Waller was appointed Head of Interpretation at the Royal Armouries. He recruited and trained the actor demonstrators, and worked with the curators to research and develop scripts and fight sequences. He worked with the Armouries on several short films and also TV documentaries under the general title Arms in Action. In 2000, he founded the European Historical Combat Guild, which studies and practices HEMA. Also in 2000, he organised the first of what became an annual event - a competitive (not demonstration) jousting team tournament held over the Easter weekend in the Museum Tiltyard, for a trophy called the Sword of Honour.