I had a similar problem with an old statesman I had , on that I was able to reach up from underneath and managed to hook the bonnet release cable and yanked the hell out of it from underneath which gave more travel than just pulling the bonnet release catch from inside the cabin, coupled with a good dose of WD40 from underneath in the general direction and a mate pushing up and down on the bonnet. A new release cable was cheaper than a grinder thru the bonnet. dunno if it will work with the FFFy