Jacqui on the whole agree I with you, the birds sold in pet shops are breed in captivity and would die if set free, although it is better to have more than one. We always allowed our budgies to fly free in a secure room, and when it was time to go back in their cage would hop on your finger to be put back, so it is possible to give captive birds the best of both worlds.
Kent pet shop is one of the best they speak english and have a good sound knowledge of animal care, give them a visit and see what you think.