Ah alas The Minories is no longer opposite, since they moved building. But its only a five minute walk away
On topic if you can focus enough to study on the train then you would be able to get a lot done, I didn't have that kind of focus but still had enough time to study every night after a hour and a half train ride there and back.
I also in the first Phase I has a weekend job it was not ideal, but there were people on my course who got very high averages who had part time jobs for the whole course so I guess it depends on the person.