In my youth I visited the science museum in London and remember it being really interactive and was planning on taking my 9 year old on our visit to London (we live the other side of the country). When I went to book tickets there was lots of add on experiences such as the wonderlab. I was hoping someone local to the area would be able to say how interactive/exciting it would be for a 9 year old without the extra cost or whether we need to book an experience to make it more hands on rather than looking at displays.