Hitchin has several hair salons who can offer you just the styling you are looking for - you could possibly even organise a light champagne-breakfast with the girls while you're there! Alternately, you may wish to hire a freelance hair stylist who specialises in weddings to come to you on the morning.
And, for the lads, why not hire out a barber's shop for a couple of hours where they can all go for a trim!
