You cant remove the grill with it shut without hack sawing the clips off Well when we took the lock itself out we didn't put the barrel back in, to it still locks shut but you hate to use like a hook to turn the wire as you would imagine the lock barrel would if you understand what i mean haha..

I'm sure my dad spoke to someone at Ford and they said when they have the cars come in with the same fault they just do what we did remove the lock from the underside.

It might be best just to go and buy a new lock/ barrel from ford once it's out though.

But that would mean you would have a separate key from your main just for the bonnet.