You may need to go to court to obtain an order for your son to be returned to your care or for contact in the alternative.
Normally you have to start this process by attending family mediation - see here for a link to find your local mediator:
http://www.nfm.org.uk/. Assessments are usually around £30-£40, and the mediator will advise as to how many sessions might be required. Mediation is a collaborative approach and allows you to talk through issues and concerns in a safe and protective environment.
Following that, if the mediation does not succeed in a successful agreement, you can apply to the family court for a child arrangements order (see below description), setting out the living arrangements and contact arrangements that you would like to see.
If you are concerned that your child would be at risk of harm in the mother's care and there is a risk that he will try and remove them from your care if contact is not agreed, you could consider applying for a prohibited steps order to prevent him being removed from your care. For this type of application
You would apply on a c100 form, here:
You send 3 copies of this form to the local family court centre.
Alternatively, you can apply online:
Child Arrangements Order:
The same form allows you to also apply for a child arrangements order. Here you ask the court to set the ground rules for contact, such as time, frequency and how and where it should take place, whether it should be supervised or not, that sort of thing.
So the c100 form is for both a child arrangements order and a prohibited steps order and you can make both applications at the same time.
There will be a court hearing after you apply and a family court adviser will be there in attendance too (from CAFCASS).
The application costs £215.00, and you can represent yourself so you don't need to engage a lawyer. You can also possibly get a fee exemption if you are on low income/have low savings.
For this you would need to fill out a fee exemption form: http://www.gov.uk/get-help-with-court-fees
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