Is it a good choice for retired people (about 60 years old) to immigrate to Britain to live?

I don't think so. Britain is an old industrial country. The construction of big cities is almost saturated, the environmental pollution is more serious, the activity space is relatively narrow, and small cities are afraid of imperfect supporting facilities and inconvenient life.

I suggest immigrating to New Zealand or Australia. Good air, pleasant climate, small population and perfect security system. Absolutely suitable for old-age care. Live at least 3 to 40 years longer.