According TristarBlog and the press-release of AGD SYSTEMS Corporation USA, six of ex-RAF machines will be shortly put into service on behalf of AGD...so, good news for the L15 // L11 drivers, techs and lovers.
TriStar500.net News: AGD Systems takes six TriStars from RAF
AGD SYSTEMS Corporation Announces Capabilities with Addition of Six (6) Tristar L-1011 Tankers for Aerial Refueling, Cargo and Medivac Missions - PR.com
According AGD, they already have FAA civil regs reserved.