Been there, done that - but a long time ago, not long after getting the 110, so not sure of just what I did.
I'm pretty certain that I simply released the catch and then forced the bonnet up, fortunately without any damage. 
You can remove the grille and get access to the lock, but I am not sure that this will help, as the problem is not the lock itself, but the fact that the bonnet is pushing the plunger sideways. If you lever the hinge that is unseated up so that it jumps above the bit on the bulkhead, this may reduce the pressure on the catch.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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