Need to cover school hours? Fire Tech Camp has several week-long holiday clubs including a Teen Coding With Python course for 14-to-17-year-olds (from £320) at locations across the city. They can also try out Video Game Design, and Junior Augmented and Virtual Reality classes, if they really want to geek out.
There are classes like this running all over the city. Blue Shift is running Creative Coding courses (£375) in Kensington for 10-to-14-year-olds to play around with JavaScript. And the February Technology Camp (£345) at The London School of Mathematics & Programming sounds pretty cool – it covers programming, robotics and 3D design and printing.