Hello lovely,
There’s a website called, Voice of the child” and it has some great info.
It states that in order to ask for a variation, your ex has to spend a minimum of £10 per week on travel.
The discount for travel is £0.01 per mile. So based on 20 miles that equals 20p.
Firstly, your ex wouldn’t qualify as his visits are once a month and even if he did what can you buy with 20p?
With my ex, I kept contact about things like this in writing because then you’ve got a paper trail and can prove how unreasonable and controlling he is.
Don’t worry, things are on your side. Good luck and let us know how you get on