Belfast-based Abba stan Shauna McLaughlin makes the pilgrimage to London to review the dazzling and groundbreaking virtual concert Traditionally reviews are written the day after the event. That didn’t happen with this review of ABBA Voyage because that day was spent hanging around outside the Arena in the hope of getting tickets to see it again immediately. Which is an impressive review in itself. The other point I want to make is that you’re better going in knowing nothing about what to expect. I may as well just stop writing here really. ABBA’s virtual concert residency, running since May 2022, with seven…