A stone is quite a lot of weight to gain in muscle.

You are restricted due to the amoutn of sessions you can get in. There are lots of fancy ways of training but if I were you I would be looking at simple circuits. Getting every body part covered in a session. You could always add cardio in too but tbh if you are doing circuits quick enough you won't need it.

Or are you after specifics? i.e I name you a routine and you go look it up and follow it? Piplins, 5x5, DC, push/pull etc etc?