Well tradition says they must, however this can do nothing for the
grooms nerves! Not only does the groom nervously check his watch (some
have been known to take them off and shake them) but also the registrar,
vicar, photographer and just about everyone else.
Some local traditions even deliberately try to slow the progress of the
bride to church, as in Wales, where country weddings are renounced for
‘unforeseen’ obstacles between the brides home and church.
So yes while tradition is a good thing then better to be just a moment
or two late, than any lengthy delay as this eats into other timings
throughout the day.
After all a wedding day is a hectic time with tight schedules and lots
of emotion, so stick to the clock and have a great day.