HELLO UPINTHESKY
nothing to worry about, very easy, one group excersice, - one to one (2 to 1), interview- last for 40 minutes-and the presentation of the company-
i had my interview last wednesday and i got a letter yesterday saying i been succesful, but not training courses at the moment, thats means im i hold.
so go there be your self, relax and enjoy your future flight!!!!
about accomodation there is a lot of hotels in the bath road, i believe the cheaper is ibis or holiday in.
good luck