English foursome Arc emerged from Skip Bifferty [aka Heavy Jelly] in 1970. They were a lesser but very talented blues-based heavy prog outfit comprised of Michael Gallagher's keys, Tom Duffy's bass, the drums of David Montgomery and guitarist John Turnbull. Occasionally compared to Patto though they also remind of Supertramp if that group had been young and hungry, Arc sound not unlike many bands of the era who took from what the Beatles had established but adding a harder, rawer feel mixed with the semi-classical sparks of early Yes, making 'At This' a respectable collector's item.
This impressive, but rather underrated soundtrack album to documentary movie about motorcycle racing was taped by the classic Gong line-up in May 1971, at the very beginning of the recording sessions for their amazing "Camembert Electrique" LP and then released by French Philips at the end of the year. There's no keyboards or synthesizer parts at all, just extended guitar-dominated, heavy psychedelic and mostly instrumental jams (with occasional vocals and space whispers) filled with very intense and mind-blowing glissando guitar notes & vibrating sax noises against hypnotic & pulsating rhythm section.
The fourth series of Out of the Unknown began production in early 1970. Bromly and Parkes were now free to put their own creative mark on the series. Encouraged by Head of Serials Gerald Savory, they sought to recast Out of the Unknown as “not straight science fiction, but with a strong horror content, all starting out from a realistic basis”. The decision to move towards psychological horror came about partly because of the difficulties involved in finding suitable science fiction scripts, partly because the production team felt that their budget couldn't compete with the glossy fare offered by the likes of 2001: A Space Odyssey and Star Trek, the latter had just begun to be broadcast in the UK at this time, and partly because it was felt that science fiction could not compete with the real-life drama of the Apollo moon landings then occurring.