Join Date: Apr 2006
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The main latch seems to be the problem, needing oiling or greasing regularly.
From the photos - It is prone to sticking because it is recessed and dirt and water collects in it.
It is possible that it does not lock properly due to corrosion and partially engages and then the bonnet is released due to bumpy roads or wind buffeting. Then the bonnet will fully open if the safety catch is stuck or because the safety catch is weak.
Currently in andy_tech's garage: