Court... any advice massively apprecitlated 🖤

[LawsonPeyton1]

This may end up slightly long winded so I apologise in advance
Basically, my ex and I have been broken up for just less than 2 years and have 2 children together. The beginning of the breakup was messy a lot of back and forward etc. Eventually we ended up in mediation. Twice. The result ending in him having Friday night's until Monday. However. I am still picking kids up from school on his days and picking them up early morning Monday to take them to school because neither him not his partner are able to do it.
Recently things have become heated again resulting in threats of court etc. And I guess I just want to know what to expect in case it does go down that road. Our schedule we have atm is stable and the kids are settled with how things are.
Since he left I have provided everything for my children, had to pay him money for him to have them even though he's the one working. He is still not financially stable, often pays less maintenance than he is supposed to, I do a lot of running around on his days etc to make it easier. He recently lost his car so I've been doing even more doing every school run etc on the days he's meant to. Hes moved house 3 time in a year.And there is a lot of other things. I'm financially stable and provide everything for the kids and I do everything for school etc. And I just want to know if he would have a case accepted or if he's gain extra time anything like that? It will break my heart of he takes them any extra days or anything I'd be happy to just go tine as it is but with him actually doing what he's meant to on his days.
There is a bit more to it but This is just a simplified version
Any advice or experiences would be greatly appreciated

I’m not sure I’m following this. If he has them Friday to Monday, when, apart from
Monday, is he doing the school run? Is he meant to pick them up on Friday after school?

If he doesn’t have a car, and needs one to collect and deliver to school, I would pick
them up on Friday and deliver them to him. I would want them back on Sunday evening and do the school run myself on Monday morning. It would seem more organised for the children too. Less running around for you.

You are the main caring parent. You are not stopping him seeing the children at weekends but he needs to step up and do the caring properly. If it goes to court, make sure you get represented.

Yeah he is meant to pick them up from school on a Friday. I have always picked my little girl up because she finishes before he finishes work but he normally gets her from me then he goes for my little boy then Is meant to take them on a Monday, but since his car was repossessed I do everything.
We have a mediation agreement which states he gets them Friday afternoon till Monday he frequently asks me tonnage them Sunday nights but refuses to change the agreement to give me Sunday nights back properly as it would mean his child maintenence would go up again. I try to keep the peace mainly by doing the run around as the kids have witnessed enough animosity and it finally seemed like we were communicating better for the last few months but he's started being nasty and hostile again. Yet still expecting me to do the run around.
I'm considering seeing a solicitor just for the sake of advice etc. X

I would see a solicitor. He needs to keep to the arrangement but ensure he can organise it efficiently. I would try and go for a Sunday return to you. Much better for school and nursery on a Monday morning.