I have a '99 Zetec estate 1.6 (T reg).
Handbook specifies 29 front and rear for a 'normal load', (specified as
'up to three persons'), and 32 front, 46 rear fully loaded (defined as
'more than three persons').
I'm sure this is meant to be a range varied according to common sense: if
you put 46 in the back with only four persons it defintely doesn't handle
properly! When the vehicle was serviced by Ford it came back with
pressures around the 36 mark (in the rear at any rate) - either the garage
don't bother to check the correct pressures for each model they service, or
they are used to usng a compromise setting within the range.