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Your ex cannot simply change the existing arrangements since they are the subject of an Order which you can apply to enforce if need be.
If she wishes to change then then there does have to be an attempt at mediation and then an applictaion for a new Child Arrangement Order.
Equally if you wish to change the arrangements the same applies
There are no longer residence orders - they are called "child arrangements orders'
There is no point in getting CCTV footage.
It is accepted that many children who are genuinely distressed at handovers settle swiftly afterwards - so neither the evidence of distress nor the evidence that he is happy have any great relevance
If you would still like a phone call then I will send the request - but please be aware that the site charges extra for the service
Please ask if you nave any further details