If your coming to London, I can strongly recommend that you see Mama Mia, the musical featuring Abba’s hits. Its not about Abba but the storyline incorporates their hits. It is a really first class feel good show and it will do you the power of good. Another good show that the children also will enjoy is The Lion King - this too will cheer you up no end and its the tonic you all deserve as a family.
I’ll second what Jannie1 said about the Lion King. It’s a brilliant show and well worth seeing. I haven’t seen many west end shows so I don’t have a lot to compare it with but it’s really good all the same. Have a lovely break and take care.