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is pretty dodgy
No, it's what the Nazis did, that's what it is.
This is not just a bit iffy or something, if that person has no other actual citizenship, then it is illegal under international law, period, end of discussion.
In this case however, it seems the guy might have Pakistani citizenship? Which would make it not technically illegal, but still an incredibly incredibly shitty move. Par for the course considering it's the Home Office though.
Stripping citizenship of people born in the uk but may be eligible for citizenship of another country through their parents heritage is pretty dodgy. Anyone with an Irish nan could have their uk citizenship taken away if the home office say so.