Open My Bonnet.?

Has it completely snapped or just gotten loose?

If it is just loose you need to bang about half way up on the "hump" on the bonnet just to the left of it (driver's side).

Worked perfectly on my old car every time .

Otherwise can you see any of the loose cable? Hopefully it hasn't snapped in the engine bay so you can just get pliers on it and pull to release.

Or jack the car up, take off the under panel thing and then work up to the cable and pull with pliers?

Like Rich says, you can reach up inside the mouth and squeeze the latch with your fingers. I've an intercooler and oilcooler up there and can reach it ok. Bit of a fiddle till you work out the bit you need to squeeze but does work.

Replacing the cable is about a 20min job... did it a while back and is pretty straightforward.