Perhaps if I list all the ingredients in the tale, folk could then rearrange them into something plausible
In no particular order then:
Flashing headlights
A large bush
Getting The Boy to school
Wet hair
Being very late
Mrs Nick's ability to faff
An inquisitive neighbour
Returning to find a car in the drive
Rain
Blood pressure
Forgetting things (ref. Mrs Nick's ability to)
I think that just about covers it