It's vital for all MGF built before YD511059
We found this issue back in 2004. Been on a trip in the Alps with 30 cars and my MGF coolant boiled when I parked her at the first pass, stop at Penser Joch.
Thought it's the dreaded head gasket, but after some investigation with help of Tony ( http://www.apttony.co.uk/index_MGF.html ) we found the front fan sticky and the Fuse F2 had blown.
Made the fan rotation again by hand and replaced fuse with a 20Amp type after comparing my fuse panel cover with another friends TF parking beside mine.
http://www.mgfcar.de/event/2004_kaltern/index.htm
http://www.mgfcar.de/event/2004_kaltern/dsc03132.html (ff)
and
http://www.mgfcar.de/fuse/
scroll down to F2
btw. as another precaution against a blown fuse F2 I put a buzzer parallel to the fuse
In case my fan gets stuck again and the even the 20Amp blows then the buzzer will make noise.