I was in the opposite position. I was in the UK and I thought about staying because of the reasons many people cite (better career prospect and all that jazz), then I decided NOT staying was a no brainer because:
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It is extremely difficult to find a (good) job in London, especially if you don’t have an EU passport. I know so many ppl in really desperate positions (like from India or Ukraine or something) and it’s been forever and they are still working part-time job for £7.50/hr. These are all people with really good qualifications (perfect English, master’s degree etc.). I even know an Australian whose like a straight A student with lots of work experience in Melbourne and I dont’ think she’s found one (though her standard is higher since for her salary in London is shit and she’s only staying for her British bf). The job market is so saturated.
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Even if you do get a job, the rent is just too much. I don’t know a single person living in London, in their 20s, who’s not living with a flatmate or 2, even couples are living with flatmates OR with LANDLORDS, haul ass no thanks. I’m still doing an internship in Taiwan (so I get paid shit money) and my shit money is enough for a studio that’s 3 mins away from a metro stop and 3 stops away from work (near Taipei 101) and I’m not completely broke after my other expenses (which granted aren’t a lot).
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Overtime sucks but in my field overtime is much, much worse in places like London.
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I hate commuting in London. The tube sucks balls and is soooooooo expensive.
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The food in general sucks and I would not want to cook after work.
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The internet connection is a joke. Though I guess that actually is a good thing since I was a lot less attached to my phone in London.
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Everything is just really expensive except dairy products like cheese and yogurt and junk food from Iceland, both of which I can live without.
I didn’t really mind the grim/pessimism there since I never really followed English news.