durin' one of his regular chatterin' sessions, soap finds out that ghost's only "permanent" residence home-side is near manchester - he doesn't know what happened before ghost became ghost, but he knows it was bad
[movin' somewhere new means building a new life and bringin' simon riley - under that name or a different one - back into existence, and ghost doesn't know how to do that]
soap decides that is the opposite of okay with him. so he drags ghost home with him, and very, very patiently watches as ghost relearns how to be simon riley, tentative and unsteady, while soap shows him around edinburgh. it's not perfect, because trauma of that magnitude doesn't just go away after a couple of dates - they're not dates, they're just coworkers helping each other out, it's fine, soap has a handle on this - but progress is progress
it becomes a tradition, too. any time they're both home-side, soap makes space for ghost to stay for a little while. sometimes, the others come too, callin' soap selfish for not lettin' them crash on his couch like ghost does, and it's good - a little safehaven for the 141 on the fringes of scotland