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Hello, I am Keith, one of the experts on Just Answer, and pleased to be able to help you with your question.
As her father was a Japanese resident he had no exposure to UK Inheritance Tax (IHT). Assuming that all Japanese taxes are settled your wife receives the inheritance UK tax free. Just warn her bank of incoming funds and their source to preclude any money laundering inquiries a large transfer might otherwise attract.
I do hope that I have been able to set your mind at rest on this matter.
Thank you for your support.