The cost you pay is the normal price of a booster - insted of the full price of puppy jabs
so it depends on the vets, my vets charge 37 for booster and 50 odd for the full lot,
with the voucher the vet will do the full puppy jabs, i had layla restarted useing this
as she never recived her full puppy jabs, and its been over 2 years since she had her jabs
so it cost me 37 quid insted of the full price.