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This can work but I do not have the UK 1.2 patch, others outside the UK could try this. You need to know how to install a patch using ps3 proxy gui
1. Open up 1.3 patch with a hex editor. We must copy the text highlighted
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2. Now open up the 1.2 patch. Paste the code from the 1.3 patch and overwrite the hex code in the 1.2 patch.
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You are basically modifying the header, this should trick the ps3 into thinking its a 1.3 patch but file will contains 1.2 patch data so should install the 1.2 thinking its a 1.3
Experiment with it and see what you can do with it
Rep if you find this useful