I'm going to suggest to the SSPCA guy that the bird is sent to a local country park that has a big flock of doves, if it can't fly again they also have big aivaries that it could live in. I'm dreading them putting it to sleep simply because they are relatively common birds though. I'm going to ask for a phone number so I can check up on what's happening.
EDIT: Forgot to say I checked it this morning for a ring but it had none, what it did have was some fishing line that had gotten caught round its legs, my and mum cut that off. I wish they'd ban fishing here, for every responsible person there is 10 iresponsible ones.
The bird has just been collected, the guy looked at it and confirmed it has been shot and it's not likely to fly again as the shoulder was shattered. He questioned what kind of life it would have if it couldn't fly so the most likely thing that'll happen is that it'll be put to sleep. He thinks it ame round to drink and was snagged in fishing line and someone took a shot at it.