Re: Bonnet won't open
Have an assistant press the bonnet down a little as you pull on the handle. Hopefully that'll take a bit of tension off the latch to enable it to be released.
When you've got it open, degrease the mechanism, lubricate the mechanism with bearing grease whilst your assistant works the handle back and forth.
The safety catch is adjacent to the "V" in the "Land Rover" decal.