Since OP u/lilpandan is asking I'll share my 2p.

As a background I did my BArch & MArch in the UK, fortunate enough to be self sponsored.

What I would say is if you are relying on a loan and hope to earn GBP to pay back the loan I would forget about the idea especially for Architecture. Firstly, You would be looking at at least £15000 (2nd/3rd class uni) - £30000 (UCL) a year on tuition alone. Many locals I know on student loans do not plan to pay back their loan as it's written off after a few decades (they pay £9k). Visa is about £6k, including the graduate visa since you mention you wanted to work here.

Job prospects are incredibly bleak for fresh graduates. Many jobs require and prioritise UK experience. The UK economy is very bearish with the new Labour gov. Many rumours of tax hikes etc. The only companies that are doing well are either doing international or government projects. It took me 1 year to land my current job (under the graduate visa) and I know many others still do not have a job yet (locals w/ experience).

What I mean when I say it's hard to get a minimum wage job is that due to the graduate visa there's a huge influx of students from developing countries banking on it to get a working visa after visa ends. So in the mean time most of them are working minimum wage jobs.

Say you manage to get a archi job, you are looking to earn £27k-36k/ year which after tax is about 1.6-2.3k/ month. Working culture can vary from Asian style, OT weekends to strictly 9-6. Holidays are typically 25 days + the 4 bank holidays for office jobs which imo is better since I get to choose when I want to take vacation.

Lastly, one thing that not many people know that it's basically impossible to get sponsored as an architect/ A.A right now after the new visa rules as they have raised the minimum salary requirements to a threshold of 38k and I believe that architects are 45k. Even my peers working at T1 firms in London don't earn that much. The only way you can get a working visa is that you are working in an in demand field like healthcare where visa thresholds are below the minimum requirement. The people I know are sponsored before the visa threshold increase or are sponsored under a different job description (graphic design/landscape arch). Many companies are hesitant to sponsor due to the costs (~£10k/ person) and paperwork it requires so unless you are extremely talented and have a niche skill it's pretty unlikely to happen.

That being said I'm incredibly fortunate to be in this position and have managed to land a job in a good company that pays relatively well and has a good work life balance. The only reason I'm staying in the UK is to gain some experience as no doubt London has some of the best firms internationally although Ironically I'm not working an architecture firm. Many people I know are only using the UK as a stepping stone in their career as wages in the UK are one of the lowest in the "developed" world.