Fane/Wharfedale Titan 18"
Could it be a driver from the Wharfedale Titan range, as Fane and Wharfedale were part of the same company and manufactured on the same site in Leeds during the nineties? I'm not sure, but I would imagine that Fane are still used in Wharfedales PA side today. I did have a look, but Wharfedale's range only goes up to a Titan 15" sub. It may be worth ringing Wharfedale or Fane themselves.