Mr. Shnreb is the asexual maths teacher who caught Timothy Sutton fingering Jessica Harris (and wiping the residue on his shirt) in 'The Blue Light Disco Sketch' before blasting off (see Episode 6). He is often heard to exclaim 'I'm asexual!'.
In Episode 8 it is revealed that Mr. Shnreb loves the film 'Eggy Boys Goes to the Army'.