Yes you can, you have to apply in writing to live out.
However if living out is deemed to effect your performance at work, permission could be withdrawn.
You could still live out, but would still have to pay accomodation and food (of PAYD is not applicable) charges. Also if you are unable to make it to work (car broken down, accident etc) you will be in the shite.
all the things that you have down as pros after a while become cons i much prefair 4 man rooms, getting to know the boys, by being thrown in the deep end. with a bunk its bloody boring, ok you have hot an cold running pisser but thats about it. having company is out of the question because of the space so your forced to go to the bar, which isnt so bad i suppose. defo dont live out though on your first posting wrong move indeed, unless your privatly wealthy no way youd be able to afford it.