Carpathia
Having taught that aircraft at BAe, I thought your girlfriend's hair dryer WAS the APU.
The APU is actually a cunning term for tail mounted ballast, required to keep the aircraft in trim.
A proportion of aircraft actually have functional ones fitted in order to keep the CAA Ops Inspectors fooled (easier done than said from what I hear).
Take care all , at least you don't have to worry about Rollback anymore!