@bazza, Yep. If the payload was one (or a fleet segment) of a constellation of identical satellites, building another copy isn't as big of a deal. They can snag one reserved for a future launch to fill in a hole. If an operator is putting up a replacement and the old copy has been on station for a decade, the new one is likely to be different. The old one in orbit might not have 2 more years left in it if that's the delay to get a replacement remade and launched.