In Ireland, you can study English as part of an Arts degree at 5 universities. In Trinity it's different. You can study English alone or combine it with one other subject. These combinations have their own points requirements- driven by demand. English and History for example is quite high, English and Psychology is almost the highest points you can get. English in general is very competitive and in high demand- so grades needed are high. English by itself last year was 505. You would need AAA relly, or AAAB if you want to combine it- average points to combine English would be 535. By contrast, Arts courses in the other universities are standardised, and hover around 360 for all subjects, whic you choose later.
As an EU citizen, you qualify for free fees. Your tuitin fees are paid for you. Your registration fee (often called 'fees by the back door') will be around €2000- 2500 per year. I starte in 2007 and it was around €800 then, unfortunately it rises every year but they are trying to cap it at that now. And obviously nothing in comparison to fees in England. €2000 would be roughly £1700. Student loans are not really done here at all, because of free fees. The grant system is extremely flawed and delayed, as well as being cut severely in recent years. You would have to resident here for some time before you could apply. As an English student or English-combined of Trinity you would never have more than 15 hours a week, so just get a job like everyone else. Jobs tend to pay €9 an hour, which is above our minimum wage. It's possible to work 20 hours a week with so few lecture hours. I earned €15k a year in my job, certainly enough for rent.