remotely. The location work using the car was conducted in and around Burnham Beeches during the autumn of 1968 and proved challenging as filming was often disrupted by low light levels. On some days only two minutes of footage were recorded. Technician "Wag" Evans, who was responsible for operating the car's radio control, remembered "standing out of shot and having to 'drive' [the car] down the road while it was out of view. Often I didn't know where it was, or where and when it had stopped." A crew member with a large cushion would be on hand to bring the car to a halt whenever it went out of control. Music Barry Gray's theme music – a chant with church organ and percussion accompaniment – was his first Century 21 composition since Stingray to include vocals. He developed the initial concept into a three-part fugue in the style of Bach. Originally the vocals were to have been supplied by The Swingle Singers, but their prospective fee was too high for the music budget. Gray therefore hired the Mike Sammes Singers (who had sung the Supercar theme several years earlier) to perform the vocals in an imitation of the Swingles' style. The theme music was recorded in a four-hour studio session on 16 October 1968 and is described by Archer and Hearn as a "glorious piece of choral lunacy". Both the opening and closing title sequences feature shots of St Michael and All Angels Church in Hughenden Valley, Buckinghamshire, which doubles as the church of Father Unwin. The opening title sequence begins with a zoom-in shot of the church against a backdrop of fields. This features the title graphic sliding down into view and gradually filling the screen – an effect was inspired by traditional imagery of angels descending from Heaven. As well as the theme, Gray recorded incidental music for four episodes in three additional four-hour sessions. The first of these was held at Olympic Studios in Barnes, London on 12 November 1968, when an orchestra of 29 instrumentalists performed the music for the first episode, "A Case for the Bishop". Recording for "A Question of Miracles" took place on 11 December at Gray's private studios with an ensemble of eight. The other two episodes to include original scores are "The Feathered Spies" and "Last Train To Bufflers Halt"; the remaining episodes use music recycled from the other four