scummy, agree with all those who say keep phoning. Make sure each and every one of your chosen schools know you want to stay on the waiting list. Ring every few weeks. Find out where you are on the list each time. Remind them that you have twins, so if two places come up you will get offered both. Take the name of the school secretary, keep a dairy of conversations. Above all, don't give up hope.
My oldest son has got into two primary schools after being on the waiting list. In each case we were told he had little chance of a place. We waited, we phoned, (we didn't go as far as bells dh and salsa with the head and hey presto we got a place in the end. Some families move away and forget to tell the school, some families don't bother to confirm they have a place elsewhere. I get the impression that lots of decisions are made in the last few weeks before term begins - or especially at the end of the previous term before the secretary goes on holiday. Ask when the busy time is for each school. Keep phoning right then. Ask when the school office is open during the holidays, too. We were offered a place right at the last minute - a week before term began. A friend who was on the waiting list for longer than us but had not phoned to check was not offered a place -her name had just disappeared. You are not being pushy by phoning every so often, you are just making sure that the busy secretary faced with these ever changing lists has not forgotten you.
My son has been on the waiting lists of 4 or 5 other schools but we didn't phone because these schools were not our first choice. We didn't bother to ever phone to check on progress. We were never offered a place at any of them.
Also remember, at the start of term, it's possible that some pupils just don't materialise. (This happened to me - I wanted to do a college course but it was full up until the first day saw a no-show and I got in by the skin of my teeth)Schools have to wait 2 weeks, I think, before offering the place to another pupil. Check this with your LEA. So even if your sons start going to a school that's not high on your list, keep phoning the other schools the first few weeks of term to see if there have been any drop outs.
If the worst happens and you are faced with a bus journey to a distant school, remember it may be for only a term or less even. School places do come up IME remarkably often. Keep phoning those schools!
Kyliebump has said this and much more useful stuff, so I'll stop rambling.
Sorry that your twins path to school is a rocky one at present but keep optimistic, scummy. It will work out.