yeah go back and ask for the sticker (it's yellow btw)
if they dont have any tell them you want them to get one in from another store.
they will probibly say "the offer doesn't exist" if so get them to phone the Borehamwood store and ask Dave or danny, or Carlos the manager, they will confirm that the labels should be included with the satnav taped to the outside. and should have come in with last weeks stock.
if they start getting pissy, just say right in that case, i want a refund and i'll go and buy one from another store.
when it comes to getting anything done with halfords, remember the rules:
1.) be nice as soon as you start getting uptight they wont want to help you
2.) a fit girl always helps (get your sister to flirt a bit
)
3.) customer is almost always right, make sure you speak to the manager (but first speak to the ripspeed staff)
good luck.
Owen