phone interview to ask some work status and current salaries, onsite interview with team leaders and managers, last round interview with the director, they gave me the quiz and ask some test scenarios,

I went through a recruitment company. Had initial telephone screening (approx 20 minutes) with QA team manager within a few days, then onsite (approx 2 hours) a few days later. The onsite was in 3 parts: part 1 was HR type person asking questions about salary expectations, what you know about the company and filling out a form with a bunch of your personal details; part 2a was a series of 30 questions that very closely resembled questions on ISEB/ISTQB tests - it was marked and feedback given that I scored approximately 80% correct; part 2b was 3 coding questions. No feedback was given on them there and then, but I believe I would have scored OK on them because I got back to my office and coded them up to check my answers; part 3 was a bunch of HR-type and scenario-based interview questions lasting approximately 1 hour. The interview went well, I felt we had good rapport and I answered the questions solidly. One of the interviewers actually complimented me on how well it had gone in their opinion. On the basis of all of the above, I was really hopeful of a positive result. However... I was told by the recruiter 3 days after the interview that Fidessa did not wish to proceed. That's it. Nothing more. No feedback. Maybe Brexit had affected their recruitment or something like that. If so, then why had they called me in for interview as it was only 3 days before that? Really gutted as it feels like a total waste of time for both parties.