Here are a couple of other books that you might enjoy -
For Key Stage 2 there's...
Tin - by Padraig Kenny - this is a new book and I loved it. Here's the blurb... Christopher is 'proper': a real boy with a real soul, orphaned in a fire. He works for an engineer, a maker of the eccentric, loyal and totally individual mechanicals who are Christopher's best friends. But after an accident, a secret is revealed and Christopher's world is changed forever..."
I think you will really enjoy this book - there's lots of excitement and adventure.
The Everything Machine - by Ally Kennen - Three kids let loose with a top-secret magical machine with a mind of its own... what could possibly go wrong?