The 2nd failsafe lock seizes over a period of due to lack of lubrication. Bit of spray grease after a bit of wd40 works. But as the prev answer sudgested if the bonnet lifts to the first stage from the bonnet release inside the car you can lift the bonnet slightly. ( Next bit you need long thin screwdriver and maybe a torch) looking at the catch you will see a catch with a hole in in. leaver this to the right and Hey Presto!! Just remember now it's open spray grease the lock. Goodluck!!
Stevehsparks, November 2010