OK thanks for that. I know there are downsides to every approach so I wanted to know what someone would do in his place.If I was in his position, Id keep renting it out. Id look for a job, any job and study part time. Id continue to pay my half of whats left after rent has been paid and Id expect ex GF to keep paying her half also.
Id be looking at all of this as a temporary plan, so at some point in the future Id have a better job (either through re-education or progression in whatever job I get).
Obviously all this works only if I can get a job. If I couldnt get a job Id go and talk to the bank and see could I pay less until I could get a job.
Id forget about full time education for the immediate future.
He has to have some kind of plan to get rid of this debt: he could spend his whole life just paying the interest on the loan (17.5k/year) and never have any money or every pay off the capital. Debt slavery. Also there is the problem of irregular income. Minimum wage workers often find their hours reduced or that they are laid off when times are slack. Not good when you are living on a knife-edge.
Not being educated is even more expensive. I would consider this is the kind of expense that he could reasonably ask his parents to pay.Full-time education also has some large costs associated with it.
Fees, books, laptop, travel etc....it ain't exactly free wither.
After reading all this I am going to encourage him to go for the full time option with BTEA and get weekend & summer jobs to make a little extra cash. I don't think that full time working for min wage while studying at night is a better option. I once taught a night degree course and the students looked like zombies every evening for their 3-hour sessions. As a full timer with BTEA, he would only have to earn 100/week to get his income up to the level that a full time job would pay. So he could work on the weekend and have the whole week devoted to his course. I think this reduces the risk of dropout from stress.
Since originally posting, I have learnt that his place on the course is not yet secure and it seems that applications for 3rd level have massively increased on last year. Also, I have found out that he is paying his parents a near market rate for renting a room from them. I might have a chat with them about this.
I'm going to close the thread unless anyone has any further suggestions and thanks for the advice so far.