Or even better, call them PAKISTANI
The term Asian as used in UK isn’t appropriate for Arabic. They aren’t Arabs and very few of them speak the Arabic language.
It is also broader than Pakistani and also includes Indians of all religions, including Hindus, Sikhs, etc.
It is of course inaccurate when both we and the Brits use it. It never includes Arabs, Turks, Persians and other groups that are indisputably from Asia.