Should I go to the Deloitte final Interview?

Hi all,

So I have a final in-person interview with Deloitte for their Government and Infrastructure team in the business and financial advisory division. I wanted to apply for consulting but they had filled all their graduate positions off the internship. The issue is I currently live abroad and it will cost about £500 to return for an interview. I also am not sure about the job fully to justify the cost as I currently hold an offer in the civil service at the Higher executive officer level as a commercial manager in the department of business and trade. I believe Deloitte pays less and I am not sure it will align with my long-term aspiration to become a management/ strategy consultant. P.S. I am also in the process with consultancy jobs. Any advice would be appreciated.