I may have got caught out with the big house reference, believing it to be criminal as the big house is a term referring to the prison in criminal fraternities. On reflection yours PILE is probably nearer the mark, and I wasn't aware that that too could mean mansion house. So "hats off to Harrhy". Sorry if I mislead anybody.
Ive got lira for 12across and pile for 20d lira is old italian money so makes senseto me ,but I am puzzling over 24d ,geese flying east in film also 30a , message from former French president at last,I have t-r---.
thanks Andy couldnt think of a french president!but I must have something wrong cos Ihave travelling for 23a,Im having a chew on with this bottom left corner.That would make 24d begin with e.
roo I've got transplant for 23a)plan swapped with the one (the) i in transit. So take "i" out and put "plant" in. Transplant is of course major surgery. Hope this helps.