Reporting from ultimateclassicrock (the Hawkwind footage was restored as well!):
"The Atomic Sunrise festival was held in March 1970 at the legendary Roundhouse club in England and featured a number of the underground rock scene’s most shining lights. The event featured David Bowie, Hawkwind, and Genesis, among others. All these acts were in their infancy, and that’s what makes the event so interesting. Fortunately, the festival was captured on film and now, after over 40 years, the film has been unearthed.