A live recording that I barely can find anything about, but it is from the band’s own label. It is also not mentioned on the wiki pages. This is a French release under license of the original label: Fantasy. Released in 1975, three years after the short life of the band ended.
I found a documentary about the first concert in Europe in 1970. They did a tour, visiting among others the Royal Albert Hall in London. This is not that concert, and it looks like these were taken from different concerts. The sound is really bad, and listening to it is challenging. Although it contains some nice parts, I wouldn’t recommend it. There are better live recordings out there.