If it is the glass that is failed this is removable on the MGF headlight, held in with three clips.
I think Rimmers still have stocks if they need replacing but they were around £75 each last time I looked.
I did wonder if it is possible to effect a reasonable repair to the reflector by using aluminium heat reflective tape.
Home to black Alfa Romeo 159 3.2 V6 Q4 ,green MGF VVC and red MG Maestro T16.
MG - the friendly marque.