The wizards have taken a Hidden Leaf child hostage and plan to put her death. So the Allied Shinobi Force take action. They arrive with all forces about 1000 miles from Hogwarts.

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Due to the direct nature of the attack the muggle become aware of the massive force in Scotland. So it's Wizarding And Muggle Britain vs Allied Shinobi Forces

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Peak Allied Shinobi Forces means the start of Boruto's era with Prime Naruto and Sasuke.

Peak Wizarding World means 5th year Hogwarts. Voldemort and Albus are both alive.

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Win condition for the Allied Shinobi Forces - Save the Child.

Win condition for the UK - Prevent Child from being saved.

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Rules.

Everyone in is character meaning Naruto is unlikely to condone outright nuking Hogwarts and would prevent Sasuke from doing so.

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Britain knows the Allied Shinobi Forces are coming and the basics of who ninja are and who the big hitters are. Everyone can see Hogwarts. The Muggle can use nukes.