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UK plugs (BS1363) are only rated to 13A, although technically speaking the 13A fuse fitted is there to protect the cable in the event that it goes short and goes on fire.
Is this nail gun for consumers? UK plug? It may be that despite the surge in current it initially demands, it should be safe to use on a 13A line due to the average current which it draws which is probably not very much.
Understood. I guess the nail gun has a massive inrush current when you use it. Again, you can't uprate the fuse if that ring's wiring is not suitably rated.
You could take a suitably rated extension cable plugged into a higher-rated ring though.