[SML] Easter 2015 in London?

[Dale Farmer]

Hi London peoples.
     A friend of mine is taking a family trip next easter to London with 
her parents, and her daughter.  I've never been there myself, so can't 
really say what is good.   My friend is a author and artist, and her 
daughter loves dancing and imaginations.       Any good shows that a 
energetic 9 year old would like, and not put mom, dad, and grandparents 
into a coma to recommend?   Opportunity for backstage tour would be a 
lovely bonus.   Other touristy or not so touristy things to recommend?

--Dale