I was taken to court by my ex (boggled my mind as we're on relatively good terms the majority of the time) and I had all sorts of plans - he makes the schedule for when he can fit ds in and often changes it/misses days and I don't press the issue (not because I don't care but because I don't think I should have to force him to spend time with ds). He also refuses to see him if he's ill (including colds) because it makes him 'uncomfortable' and doesn't help with childcare in the holidays (he earns a lot more than me).
Having kept schtum about all this to keep the peace, I was pretty peeved at being taken to court because I wouldn't agree to let him take him away without knowing the details of where he'd be, and planned to bring all this up.
I wasn't given a chance to speak other than yes/no to questions and they mainly listened to the CAFCAS representative and referred to the court documents.
So my main tip is to make sure EVERYTHING you want to get settled is in there - down to the minute detail. Going to court is a horrible experience for both the parents and the children involved if they're old enough to know what's going on, it's best to get it done in one go.
Also worth bearing in mind that although they'll give a court order they are pretty much impossible to impose.
My stepbrother has a very malicious ex who regularly withholds access whenever she feels like it, he has paid to go to court about this three times and the judge agrees with him every time but the police won't enforce it if she breaks the agreement, they just have to go back to court all over again.
Good luck, and I hope you get what you need to out of this