Try Little House of Science, they do classes for various age groups and locations, including Imperial College at South Kensington, Putney or Wimbledon etc. if that's any help.

Not weekend, not afternoon, and not Clapham (but Richmond)... but WhooshPop are good.

Dear all,

I am wondering if there is any available Science Clubs for younger children (3-6) preferably weekends or afternoons where they can learn about basic science true experimenting. Example making a volcano or looking true a microscope.

Let me know xxxx