2.0 Sport
When I got the sport it had a nasty crack in the plastic top on the rad

As you can see it's nearly 4 inches long and runs very close to the hose connector.
After a lot of googling and youtube'ing I came across some stuff called 'JB Kwik Weld' . I've never heard of it, but managed to find some on ebay for £5 so I thought it was worth a try.
Firstly I drilled holes at either end of the crack to prevent the crack enlarging and sand (with coarse paper) to provide a key for the bond.


You then mix an equal quantity of the steel (it's not, but that's what they call it) and the hardner on something non porous and disposible (in my case some kitchen foil).


After mixing it up with an old drinking straw you apply it to the the crack. Now you only get 4 mins to apply it before it starts to go rock hard so make sure you are ready to go!

It doesn't have to be pretty, but you can sand/drill this stuff when it fully cures (4 hours) if you want to make it look pretty.
After 4 hours I chucked the rad back in got it up to running temp and thrashed it up and down. So far all is good and not even a drip.
Result!