Re: Female Pakistani students in UK.
Not all - Indeed those are , who come to good universities with the tuition fee paid in advance and their families back home send a hefty cheque every month for their food and lodging expenses 
You will hardly see them even working for 20 hours student jobs …
Now comes the upper middle class - who come with half of fee paid / with some amount in hand , and intend to cover the rest of expenses while working after studies hours …
Then middle and lower middle class students - who just want to get out of the country and gain a legal entry in any western countries .. for which student visa is still the cheapest option .. Later they try to convert it into a work visa / resident permit mostly by marrying the locals … As they are mostly on HND programs and certification courses so their fee is much lesser then degree courses ..