Need a bit of advice...

Thor1950 said:

Don't get all fookin technical. A search of white rust on aluminum will explain it, in much simpler terms

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You've changed it ...
First you said it was 'white rust' ... now it's 'white rust on aluminium' ...
and I'm pleased to see your spelling is coming on well this term ...

Thor1950 said:

Bit like mole grips/viCe grips used as generic for technically they are adjustable locking pliers. or how a adjustable spanner/wrench is referred to as a crescent SPANNER wrench

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You should really pay more attention if you're going to play in our playground ...

Here's some Landy Porn......

Engine and hoses look in good nik mate but at the first opportunity get under her and give that chasis a good going over with a wire wheel
Looks like you have had a good find tho mate well done

Cherrytree Jed said:

View attachment 90965 Here's a photo of the damage

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Bit of filler and it'll be fine.....

On a more serious note, it looks like the inner skin has gone too, look just behind the bolt through the door hinge. I did a load of repair work on my bulkhead recently (Series 3 not defender but it'll give you an idea of what's involved) including one of the top corners, have a look here:

https://www.landyzone.co.uk/land-rover/straight-6-rebuild.266514/page-2