When it comes to all-encompassing mega-sets celebrating the oft-overlooked talents of British prog, UMC has delivered the goods. They’re following up their already impressive lineup with a new, 12-CD/1-DVD box set that covers the legendary psychedelic surrealists Gong and their tenure at Virgin. Entitled Love From the Planet Gong: The Virgin Years, 1973-1975, the new box offers all their studio albums from the era, plus a wealth of rare, previously unreleased recordings. It’s all set to hit shelves tomorrow, September 27. Led by Daevid Allen and Steve Hillage and a revolving door…