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The 30 days requirement is for residential properties.
You need to complete SA108 - Capital gains Summary along with the main tax return when you file tax return 2016 (year ended 5 Apr 2016).
More information on SA108 can be found here
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Provided he has been non resident for at least 5 full years, the gain would not be chargeable to UK CGT. He would have to declare this gain in his own country of residence and pay CGT there.
More information on this can be found here
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In this case there is no requirement to complete SA108
There is no need to inform HMRC.
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You may wish to read 6.60 on page 45 of RDR1 here