I think you may find it's not magnetic??? I lost mine too so brought a magnetic bendy thingy from Halfords but couldn't get it, I then tried the magnet on the e clip that holds the main lock on which is the same material and that's not magnetic!!!
I ended up having to buy a whole set of various sized e clips which will last me a life time as I couldn't find anywhere locally that sold them!
The front one is really easy, just undo 5 bolts holding the grille onto the bonnet, undo 1 nut on the back of the grille and prize off the chrome/plastic surround being careful not to break the tabs.
I then left a hairdryer heating up the rear of the badge for ages to soften the glue and then it came off with a bit of gentle persuasion, clean all remaining glue off with spirit and bob's yer uncle stick the new one on and refit!