Thanks tiggytape and jellyandjam. To be honest I thought it was a bit of a long shot anyway. Schools are dire here, and I had very low expectations so I'm not completely panicking, but would love to be able to set my DDs expectations with all the hype around, as he knows he 'should' be finding out soon. 
With the first school, we fell into the category they used, but it looks like the tie breaker applies and we were too far away. So we must be on the waiting list there as we didn't have siblings in the school. The chair of governors has offered to chat to me on thursday and tell me where on the list we are - hooray! I know we met the criteria because we chatted to them at length about it, but I guess there were just lots of people and not enough places.
With the others (choices 2 & 3) it looks as though the local authority haven't accepted our social grounds because they have accepted children in rule 5 who were nearer than us on distance alone. I'll contact the schools directly by email (thanks for advice) to find out if they can give us any information on why they haven't accepted our social grounds.
The social grounds application process seems to be so subjective, it's hard to know why they would have made their decision and if so, whether or not it would be worth appealing. I'm surprised all you get is a yes or no. There seems very little guidance on the specific criteria around it so it's hard to know what they're looking for.
Do you know if all LA have to consider social grounds or not? The information seems sketchy at best.