Try this:
https://www.student-loan-calculator.co.uk/ Say you did 3 year course (on say 15k a year including tuition fees + accommodation combined totalling 45k) and you earned less than £26575 or less you do not pay back anything. Anything above that is 9% on the difference.If you earn £30,000 you will pay 9% of £3,425 difference. You pay this for 30 years then payments will stop.
If your parents are high earners, you would get less maintenance loan therefore you have 3 options. You can either have your parents pay for the difference on your outgoings, or get a part time job to fund that difference, or have a mixture of both parents and job.
It is sad for a parent or carer to have their loved one move out, of course it is. I know i'm going to feel it. But this will be enriching for you, and not only that, having that independence stands you in good stead for getting your own place one day and dealing with bills, budgeting, and looking after the house, and yourself. I would go with the approach for trying this for a year to your parents to see how it goes. if you feel halls has given you more confidence to go on to second year accommodation with friends, then great. If its not working out and you feel you could do better at home for second year, then do that. Also if (you have not done so already) you start doing things for yourself now, ironing, washing, cooking for yourself and even doing a budget now working how much this all costs, your parents will have more faith in you handling this and be more confident
And lancasters accommodation is great. Its got the porters and security and a good community feel. Are you starting this year or are you applying for next year? if its this year, id get your skates on with the student finance application.
And wouldnt it cost more for railfare than accommodation too? definitely work all these things out.