M.J. Trow's written 12 (or so) books in the Peter 'Mad Max' Maxwell series. Now before any Australian's get too excited, this isn't the sort of Mad Max that instantly comes to mind for us. There's no desert, no strange vehicles (unless you count his bicycle), and there's definitely no similarity between the plots. There is, however, quite a dry, laconic sense of humour that's actually quite catching after a while. (Early on it does seem to be laid on a bit thick, but go with it - you get into the swing of it eventually).
From the Blurb:
With girlfriend DS Jacquie Carpenter back at work and little baby Nolan rapidly growing into a feisty toddler, Peter 'Mad Max' Maxwell, Head of Sixth Form at Leighford High, decides to hire an au pair. The exotic Juanita Reyes seems the perfect choice. But one afternoon the lovely Juanita disappears into thin air, and two ramblers are suprised - and not a little disturbed - when their dog digs up a body on Dead Man's Point, the lonely cliff top rising high above the sea."
"The nonsense stopped as soon as he entered the room. He let the door crash back and stood there, watching Tasha Whatserface smear lipstick all over her cheek."