Re: 147 rear hub bush replacement!
I don't know too much about this, but when I had the suspension on my 147 looked at by Palmer & Phillips in Oxford, it was due for new rear bushes. They said they charge an hours labour per side, but it sometimes takes longer because of a long bolt (not sure if they meant the transverse long bolt).
You could try being cheeky and giving a specialist garage a ring and seeing if they'll tell you how they do it.
If not, the threads been bumped anyway, so maybe someone can help!