Going to paint my front grille tomorrow so want to remove the badge. I had a quick pole around it with a screw driver which feels like it's just going to damage the grille.

I've removed it and can see two holes in the back of the grille, do they need drilling out to remove the badge and the rest is just glue?

Nah, just sticky stuff, warming it up helps.

Yes heat up with a hairdryer

Wonderful, will put it in my home made oven in the garage to put the headlights in

A box with a hole in the inside to put a heat gun in.

Yep thats what it is. Bad time of year for pulling adhesive things off isn't it