Some girls may go out by themselves or with freinds, but i've noticed that alot of us who are born/raised here (in the west) still have very strict family back home who observe traditional rules, one of which being girls cannot go out unescorted.
I would live in UK just because of the freedom. simple as that.
From what i have seen, only families living in villages or narrow minded people in Pakistan observe such rules. But then you come across same kind of people in western countries too.
People living in cities like Lahore; Isb; Karachi; Quetta; Multan; Faislabad and many more, have no such restrictions. Who claims girls are not allowed to go out alone in Pakistan? Go to any of the cities i have listed above and you will see contless women/girls walking around alone. Even at night time you will see a lot of people out, even women's.
Strtict families are living in western countries, where they don't allow their childrens to go out, not do certain things etc. It comes down to individuals families, and they exist in all parts of the world.
If anything, people living in western countries think Pakistan is being ruled by those retarded Talibans and that people their have no freedom, absolutely misinformed. Don't just rely on biased western media, they will obviously portray Pakistan negatively; due to many reasons.