Since they mentioned Lease Back opportunity, I’d say it’s exactly that–one can purchase a model, but you need to be willing to lease it back to John Laing until they’re finished with the project.
I don’t know much about it, but I know of one other example where it was actually a pretty good deal in that the developer leased it back at an above market rate.
Not sure how commonly this is done, but I can see where they’d do it in a declining market–they’d get more for it today than they would 2 years from now.