Sorry to hear that mate! But to all intent and purpose your engine is dead! Best thing would be to swap the lump and as has been mentioned before replace the belt water pump and dephaser before it goes back in!
As Mick said, possible rebuild would be easier! Saves a lot of hard work and at least if you know whats been done to the engine you would be able to trust it in the future!A decent 182 lump is going to set you back around £450-650 less fitting, fluids and belts so, and i'm just playing Devils advocate here, it may be worth looking in to having the head pulled/rebuilt and new belts done as it's probably going to cost less (or around the same at least) as replacing the engine (which *may* have other issues).
Mick
Rebuild the head mate im currently doing that the now to my other clio have it running and serviced for under 300 mate!