I made my first post without reading the first thread.
This is not a holiday problem this is a being a victim problem.
I had an 'evil' ex who was physically, emotionally and financially abusive. He didn't pay a penny and rarely had contact.
Did I feel sorry for myself, make excuses and whine that he drove a new merc and I was juggling £700 rent and £800pcm childcare on a 20k salary. Did I fuck! I put on my big girl pants, worked every day and studied every night to get a good job. I didn't take a penny off him and I showed my daughter that I was 100% in control of my life. I didn't need to go begging I was capable.
Give yourself a shake. He does not own you or your thoughts.
legally with 50:50 custody he doesn't need to pay you maintenance. He earns £100k- you don't you can't expect your ex to supplement your lifestyle when you don't want to retrain, re qualify, get a second job. You are angry at your ex for not financially supporting you but fine with your DP not wanting to progress in his job. You are even bitchy about your Ex's GF who is none of your business.
Plenty of people have made suggestions and all I've seen back is excuses.
You CAN take your kids abroad, take the Eurotunnel or a ferry.
Stop complaining about things you aren't willing to change. If you're not helping to make something right you have no right to complain about it being wrong.