For information - the IFoA recently revised some of their planned 2021 exam dates. You can find the latest dates at https://www.actuaries.org.uk/studying/exam-bookings/exam-dates-2021.
Interesting that they've confirmed the April exams to be online now. Not sure if that's because they still expect Covid restrictions to be in place, or because it's now a permanent feature.
Why is SP7 always on the same day as SP1. There are many Health actuaries that would do both of these exams. You would rather have SP6 on the same day as SP1.