I'm flying into Delhi from London soon (Virgin) and then transferring to a domestic flight (Indigo). I have 2 hours 15 mins for the transfer. Does anyone know if there is a separate terminal I have to get to and if so if it's walkable or a bus or taxi transfer? I had a bad experience at Mumbai last year when I only made the connection because the Indigo flight was delayed so I want to be prepared this time.