Background: Bioinformatics--the use of computers in biology--is of major and increasing importance to biological sciences and medicine. We conducted a preliminary investigation of the value of bringing practical, university-level bioinformatics education to the school level. We conducted voluntary activities for pupils at two schools in Scotland (years S5 and S6; pupils aged 15-17). We used material originally developed for an optional final-year undergraduate module and now incorporated into 4273[pi], a resource for teaching and learning bioinformatics on the low-cost Raspberry Pi computer. Results: Pupils' feedback forms suggested our activities were beneficial. During the course of the activity, they provide strong evidence of increase in the following: pupils' perception of the value of computers within biology; their knowledge of the Linux operating system and the Raspberry Pi; their willingness to use computers rather than phones or tablets; their ability to program a computer and their ability to analyse DNA sequences with a computer. We found no strong evidence of negative effects. Conclusions: Our preliminary study supports the feasibility of bringing university-level, practical bioinformatics activities to school pupils.