Easter weekend in London

[Otterseatpuffinsdontthey]

Looking for recommendations (Easter weekend) in London. Things to do + good eateries.
3 Adults (married couple, early 40's + older female) + 8 year old girl + 4 year old boy.
Main event is Abba Voyage (Friday).
Any opinions on the Taylor Swift bus tour?
Trying to find things to suit everyone.
Thanks in advance.

Some of the themed afternoon teas are very good but a bit ££. Peter Pan at the shard and Aldwych One Willy Wonka one as good egs. Frameless is good, out of Twist and Paradox I thought Twist was better. The aquarium is a safe bet.