I've actually already done a masters and REALLY loved it. Loved it so much. But when I did it the cost was only £4,200 - that same course now is over £9,000. I just wouldn't be able to afford it now, even with the government loan thing.
The course was about american literature and culture (before you ask 'America? culture? what culture?' i've heard that joke more times than I could count) and i just found it absolutely fascinating, but the way i described it was like an expensive hobby. It wasn't for a career, it was for me. I'd love to do something more business-y or economics-y now because I find that more interesting these days and think it would be really good for my career but normally those kinds of courses are closer to £20k and I would just NEVER be able to afford that!!!!
Oh and I would also recommend to anyone to do their masters part time. I was able to afford it by doing it this way and didn't need a loan. The £4k cost was cut in half and worked out at £1,000 per semester which I was able to save up for by working overseas during the summers. Then I worked full time and studied part time throughout the rest of the year to live. I also found the extra time to study allowed me more time to develop my ideas and do a better and more comprehensive deep-dive on the theory, which i found more gratifying.