Tinker Tailor Robot Pi (TTRP) is an innovative curriculum development project, which started in September 2014. It involves in-service primary and secondary teachers, university academic engineers, business partners and pupils at Key Stages 1, 2 and 3 (ages 5-14). The focus of the work has been to explore how a pedagogy for primary engineering could be established within the mainstream curriculum setting. Ultimately, there is a strong desire to foster teacher confidence in the teaching and learning of engineering education by exploiting the opportunities provided within the computer science, design technology (DT) and science curricula. Here the author introduces a series of articles from teachers about their experiences in using tinkering as an approach to develop engineering education in primary schools.