Is this restriction on your licence or in your ANO?
If it's on your licence then it applies to you as an individual, irrespective of what the UK ANO says, or the ANO of any country that you are flying in, and is always valid.
If it's in the ANO, then it applies to everyone in the UK, irrespective of where there licence was issued in. This is because everyone flying in UK airspace must comply with the UK ANO. However it would also apply to UK licence holders irrespective of where they were flying as they must comply with the UK ANO at all times, irrespective of what country they are operating in.
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