Don't worry chuck, you're not going on! That's why we're here - to help each other out eh?
... I think you're partner is being a bit naive in expecting everyone to get together and agree.
The children are your partners and his ex - IMHO only him and her should discuss the arrangements. As only they are both legally responsible as they have PR, then I would leave it to them. It will only add more fuel to the fire if you are present. Totally irrational I agree - but the ex IS being irrational.
So it's OK for her partner to do the collections and not you? I wonder why that is? Sauce for the goose some would say. It's pretty hypocritical of her wouldn't you say? ... but that is an argument for another day. Anyway, also remember that the ex's partner cannot be granted PR just because they may be married, he has to apply for PR and be given the permission by everyone with PR (i.e your partner) so don't believe any guff she may say on this matter.
... now, the kids are obviously upset by this unilateral change to the long standing parenting schedule. They are obviously used to the schedule and now it has been changed by the ex, without your partners consent or agreement, they are obviously confused and upset.
... so what are you going to do about it?
my thoughts are to immediately draft a quick letter to her something along the lines of
"Dear Mrs unreasonable
As you know, the parenting schedule for (children) has been XXX.
This parenting schedule has been in place for XXX time. I have notice that you have unilaterally tried to change the above parenting schedule, without any discussion or agreement from me. This is wholly inappropriate and has led to confusion and upset to (children) as they are, quite understandably, wondering why they cannot see dad/come and stay/ etc as per the normal schedule that has been in operation for XX time.
In the short and long term best interests of (children) I propose that the parenting schedule is re-instated immediately and that we attend Family Mediation to discuss any issues in a non-confrontational environment.
I have enquired at the local family mediation services (address below) and they are available at XXX times.
[insert local family mediation services address and telephone number here - find it using this URL: www.familymediationhelpline.co.uk/index.php)
If you have a solicitor could you supply me with their details so I can send a copy of this letter directly to them, however, I am hoping that we will not have to involve them.
I would appreciate confirmation within 14 days of receiving this letter that you are going to attend Mediation so we can discuss childcare arrangements in the short and long term, otherwise I feel that I would have other option but to make an application to Court
Yours sincerely
Mr Wonderful Dad"
.... this may have the desired effect. Of course it may start off world war 3.
but you have to decide whether you are prepared to have a bully dictate to you about the children - because that is what she is doing, she is being an aggressive emotional bully and using the children as a weapon. It's sick.
Look up and find out about the local family mediation services.
Read the Families Need Fathers website information (www.fnf.org.uk) - loads of info on shared parenting, mediation, court process (should you need it).
I do this to try and help you AVOID court later down the line, because it is emotionally and financially very very draining.
I was faced by an emotional bully who used my daugther as a weapon. She refused to attend mediation, refused to discuss child arrangements and wanted it all her way and me just there as a convenient babysitter/walking wallet despite there being a shared care arrangement in place which our daughter loved. She applied to court for a sole residence order, spent literally thousands (has no money now) on a wasted court action, I had to self-represent myself as couldn't afford solicitors, still skint now, and there is a shared residence order in place now (after cafcass said it would be be a suitable order in our case). FNF helped me out immensely and now I chair a local FNF branch helping other parents out too.
good luck, feel free to PM if you want a natter.
better still - get your partner to read this forum and post on here! He needs to face the situation head-on because it's not going to go away. bullies need to be tackled.