Right ok. So if this wasn't recommended by Cafcass then the Magistrates are wrong. I would appeal the decision. How long is it since the hearing? You have 21 days. That's why it's easy to appeal a Magistrate's decision (ie you don't need permission to appeal) because they are not Judges. If you appeal you get a District Judge and I have a feeling they will keep to the existing schedule and order that. Especially as the youngest is only 10!
As for your girlfriend - yes that sounds a typical thing an ex would do - complain about your gf and say child doesn't like her and get child to say that. However, having said that, sometimes children do feel a bit put out about a partner getting attention, even if they get on really well. So one thing that is good to do is have a bit of time just you and the kids rather than all together as a family the whole time.
My partner and I did this because we found it worked. My son would have the mornings at week-ends doing something with me. He'd have a couple of hours in the afternoon just wiht partner (when I had to do some work), then the rest of the afternoon and evening we'd all three do things together and have the family time. It worked well. They just want a bit of one to one sometimes.
There was a magistrate and a judge. The decision was two Fridays ago, so there’s time to appeal.
The other issue with appealing, aside from my being uncertain of their own views, is that my son is about to take his 11 plus. Don’t think it’s a great idea to put that at risk.
I feel like I’m losing my children. I don’t know whether it’s their age, or alienation, but I find it really difficult to get them to do stuff with me, even more so after the court decision. All they want is to sit there on their electronics… I need a new strategy for engaging and bonding with them.