Congrats for getting an interview!
Luckily at VA all you do is an interview! No insulting aptitude tests or group exercises!!
Very relaxed atmosphere, I had 2 pilots in mine , a few HRish questions like the usual why do you want to join , how will you fit in etc....
they are VERY hot on the virgin brand and how you will make it more effective in your role !
Also you get a scenario to look through and make notes on prior to the interview, I think mine was :
Captain is outside with the engineers sorting a tech fault , the weather is miserable (but flyable) , pax are ok , crew are all fed up and thinking of going fatigued , Cabin Manager has just told you about the crew situation.
What do you do ?
All very teamwork based questions.
Make sure you also brush up on the Delta / KLM Airfrance partner with VA , and just a few tech questions (All fairly easy )
Just be yourself and relax , interview lasts around 45-1hr