Ms Johnstone joined the Mathematics Department in 2015 after completing her undergraduate degree in Mathematics and a Master’s in Scientific Computing at Selwyn College, Cambridge. She qualified as a teacher in 2017 through the University of Buckingham while already working at the school.

Since then, Ms Johnstone has taught across all year groups, from Year 7 to A Level Further Mathematics in Year 13. She leads the Senior Maths Club, which gives pupils the opportunity to explore challenging mathematical ideas beyond the curriculum, and she supports pupils preparing for university entrance interviews in Mathematics and related subjects.

Alongside her academic teaching, Lizzy is a Sixth Form tutor and is actively involved in the school’s Games programme as a rowing coach. Outside school, she is a member of a local rowing club and remains closely involved in the sport in her free time.