I’ll clamber in and have another look.

The garage basically said that may be screwed and that getting the bonnet open could be a major performance.

I’m wondering whether I just try and cut through the retaining bolt thing and replace it

I usually use these points for charging, when I'm not using the trailer plug..

Maybe get an inverter like this one. Connect that to whatever car you're using to get to the stuck car. Then use the 13A socket for a battery charger rather than your NCOD jumper. Sit there with engine running to charge the flat battery !!

I personally think you will struggle to get any meaningful charge into the battery this way.
The original thought was to get a voltage in the system to check that starter terminal is battery direct.
Then the system could be powered up from there and a jump start done.

Then its off home to maybe a better place to sort the bonnet.

awkwardbob said:

I’ll clamber in and have another look.

The garage basically said that may be screwed and that getting the bonnet open could be a major performance.

I’m wondering whether I just try and cut through the retaining bolt thing and replace it

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Either way getting the bonnet open is going to be a PITA.
If your local breaker has a bonnet the same colour I know the option I would choose as quickest but its destructive.
As I said earlier you maybe able to reach the latch with a flexible recip saw, protecting the bonnet and grill well and you may get away with it.
But be prepared to destroy something.

J