I just recently did a show trip to London with a couple of friends in July and these are what we saw:
Operation Mincemeat was fabulous - I have been listening to the soundtrack for weeks as it's just that catchy, we only went because someone had mentioned reading about it being "Six meets Hamilton comedy with a WW2 setting" and we had a free evening so got tickets and I'm so glad we did.
Six - we've seen it a few times and it's great
Heathers - one of our (collective) favourite shows
Les Mis - my second favourite musical ever (after Newsies which we also saw the same day but that run finished at the end of July) and one of my friends hadn't seen it so we had to go
The Mousetrap - a classic and I like to see it every few years.
Hamilton - one of my friends was desperate to see it again as soon as we came out, fortunately I have tickets closer to home for when it comes on tour later in the year
Moulin Rouge - I mostly booked it because I loved Jamie Muscato last time I saw him in Heathers and I've watched a bootleg from Broadway with Aaron Tveit as Christian so couldn't pass up the opportunity to see it live.