I've just found out that Morrisons are currently offering 4 items of dry cleaning for £12. I presume it's a national offer (it's at the Newcastle under Lyme branch at present). I understand that it's usually about £5 per item depending on what it is, so it may save a few quid.
If you have any other details or corrections about this please let me know.
It's my first post, but be as brutal as you like!