That really sucks you can't change your major after the first year in the UK.
I changed my major once every year. It was Creative Writing my first year. Then I added Psychology as a double major my second. Then I dropped that double major. Finally, I switched to Environmental Studies with a Creative Writing minor my third year before I withdrew from college. Though, since I took a lot of quarters off, I was still technically in my second year when I switched to Environmental Studies.
A four-year degree was not right for me. I'm planning to go to vocational school next fall. My college courses may count toward an Associate's degree which requires gen-ed classes. Then there's the fact I was able to learn some really cool stuff in my classes and meet some great people I still catch up with. So not all was wasted.
But yeah, now I'm a full-time writer.
My goal to finish by my birthday isn't looking so bright. I'm looking at ~3K a day to finish by March 6. But I'm still determined and won't give up. I'll do an all-nighter on March 5/March 6 if I have to