1.
You will likely burn out quickly and not have the time to properly recover. This could impact your grades.
2.
Public transport is very expensive to use in England at least (I can't properly speak for the rest of the UK).
3.
You most likely have no idea how many days you'll be on campus and how many 8:00-9:00 AMs lectures you'll have. For example, I had to commute an hour every day to get to sixth form and needed to be in school by 8:30 am no matter what. Due to the way my commute was laid out, I needed to leave the house at 7:00 am everyday in order to be on time, of course I got used to it, but it was too early for my liking. When I was at university last year, I had lectures Monday-Friday.
4.
As BCU says, you might miss out on the social life if that's something that you're interested in.
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If commuting is under 1.5 hours one way, it might be manageable if you’re okay with early starts and long days.
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If it’s closer to 2+ hours, moving out could be worth it to avoid burnout and get the full university experience.
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Consider part-time jobs or scholarships to help with accommodation costs if money is a concern.