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As children get older their views are considered, but what the children want is not the deciding factor. The primary test is what is in their best interests and the court takes an objective view of this. The informal arrangement is binding in the sense that this is legal, but if you decide a change is needed then you can apply to the family court for the arrangements to change. If the court agrees with you, then a change will happen.
The next step may be a mediation rather than court and perhaps getting a lawyer for the children appointed. That lawyer is required to objectively report on what is best and this could help at a mediation, which would be much cheaper than a court case.
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