What percentage of all Pound Sterling (GBP) is held in the UK?

All countries hold reserves of foreign currency for trade (E.g. most countries have Dollar or Euro reserves). The Pound Sterling (GBP) is the third most widely held reserve currency accounting for about 4% of all currency reserves.

So if we could count up the value of all of the Pound Sterling (GBP) in the world, what percentage would be being held in the UK?
Please show evidence or sources.

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