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What is your question, there is a possible liability to UK Capital Gains Tax (CGT) here.
You declare the gain to HMRC in your Annual Self Assessment Tax Return. You have a non cumulative Annual Exempt Amount (AEA), currently 12.3K, to offset gains.
On the contrary it may be subject to Holland's CGT regime. In that event any tax paid there is allowable as a tax credit against your UK liability.
Then it would normally be an UK taxation liability.
I do not think you need concern yourself with Netherland's tax. You can continue to contact me on this thread if needed.