Hi and welcome to the forum.
Sadly this forum is for fans of the MGF/TF/LE500 2 seater convertible so there is not my knowledge of the MG3.
It might be worth looking in the How to guides for bumper removal and see if the MG3 is similar, in my experience most modern cars are similar.
Home to black Alfa Romeo 159 3.2 V6 Q4 ,green MGF VVC and red MG Maestro T16.
MG - the friendly marque.