Approximate cost of new radiator for A3

[TWH]

Just a quick quiz to see if anyone has knows a rough cost for a fitted new radiator on an Audi A3 1.8SE (8L) on a Y plate? The missus' car is slowly seeping coolant from the front, and I got under it this morning to discover it's coming from the joint on the bottom right of the rad (as you look at the front of the car).

Unfortunately, despite already removing a large amount of plastic trim to get that far, there's still too much around it for me to get a decent look, but it feels like it's leaking from a spot between the edge of the radiator, and a solid bit of metal on the end of the plastic joint from the hose.

I don't know at this point if it's a case of just replacing the joint, or if the radiator is screwed, just wanted to know the worst case scenario?!

Cheers in advance for any help!