Oh God, Lollipop I'm so sorry. I really can't imagine how you feel, how scared you must be. I know that I can't even fathom it. I wish to God there were more that I could do to help you, love. :( I wish I could take your worry and your fear and just put it on myself so you could relax.
A PP has had a good idea: going back through your threads to read how far you've come. You really have succeeded, massively! Not only that, but every time the outlook was at its worst, you managed to come back from it and get ahead for your children.
I can say I know that it's horrible, that it's YOU doing all the work, that it's you fighting not only him but the bloody system that is supposed to be there to help you as well, and that's the last fucking thing you need, especially right now!
It's horrible that you have had to do all of this on your own, but YOU HAVE done it! And you are very close to the end now; there isn't much more you have to fight. I know it doesn't look that way right now, but finally they ARE listening to you, they ARE seeing reason, they ARE seeing the truth, and they ARE taking much much better courses of action now - well, barring the bloody visits, that was stupid and insane and I simply can't understand that. The last hearing, they did everything else so right, and then that... it boggles the mind.
But the court did realise that he is an abuser, using his children to get to, control, and hurt you, which is why they stopped the skype calls and banned him from contacting you. At least they can see that, so that tells me that they will be far more receptive to the evidence of his being dangerous to DC now as well. I don't have a bloody clue why they kept the fortnightly visits, but they dropped them to half because the court at least now knows he is just not a good, loving father.
Can you ring (or have your solicitor ring) the court, and ask them to reconsider the fortnightly visits? Can you or somebody explain to them exactly what you've told us here - taking his bloody documented history of using the DC to hurt you into account, and your fears that he will warp their minds and string the poor babies along at best, or take them away at worst - and ask them to only change visits to a supervised centre? If only that small change, it would be so much easier. If your solicitor could just phone the judge or email, perhaps he could show them sense?
If that's not possible, perhaps you could have a friend (or I suppose possibly the police in the area but... they've not proven to be the most proactive have they) follow him discretely when he has the DC for visitation? At least to know where he is and whether he is taking them someplace he should not?
I'm sorry if those are just flat out stupid ideas. I just want to be able to help you. :( And maybe I'm over invested, but I really don't want him to have that kind of access to your children! It is very scary, even to me, a stranger on the internet who knows how far away and unrelated! If it's that scary to me, a stranger.... Oh Lollipop I'm so sorry!
I do hope you keep using this thread, even if only coming on here to vent and complain and express your worries and fears. There are a lot of us here who truly care and who really want to help you, even if we can only offer words.
You WILL come through this. You've come this far, all on your own, and there is not much left to go now. It WILL get easier. I know that. The ball is rolling now and you WILL succeed. I know it doesn't look that way right now, and I know it's fucking HARD, but I really truly believe that with all my heart, and I'm sure the rest of us here do, too.