Dependant upon the result of the test fires and external finish I may well be interested in this, I've been after one for a while.
My guess on prices (to be confirmed by those more knowledgable) range from £60 for something needing work to maybe £140 with good bluing and uncracked stock.
Once you've got an idea on price, if your mate wants to sell I'd certainly like the option.
Russ