Leaving the UK without an accompanied child

I will be visiting the UK on a visitor visa with my family, my wife and two children, aged 16 and 8 years. I will be staying in London with my sister's family, who is a British citizen. She will provide a proof of accommodation for us in theUK.
I am planning to visit France for three days with my wife from London, leaving my children with my sister. However, I will come back and exit the UK finally with my children.
If I exit the UK for France, will I be stopped at the airport because I entered the UK with accompanied children and I would be leaving without them?
What are the different options available?
Should my sister declare that she will take care of my children in my absence? In this case what additional documents may she need to provide? She too has two children.
Should I drop the idea of visiting France completely?
Is there any other option?
Thanks in advance.
Best Answer
It is not usual to be checked on exit from the UK, although it can happen.
France will likely not be concerned about you traveling with or without your children.
But on your return to the UK you can be denied entry for many reasons and then you will have a lot of trouble to get your children with you again.
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Can a mother take a child out of the country without fathers permission UK?
You must get the permission of everyone with parental responsibility for a child or from a court before taking the child abroad. Taking a child abroad without permission is child abduction.Can a child travel with just one parent UK?
If one parent has a residence order or a child arrangements order stating the child lives with that individual, he or she can take the child abroad for 28 days without the written consent of the other parent. It is good parenting, however, to try and agree the arrangements well in advance.Do you need a notarized letter to travel with child UK?
If both parents are travelling with their child they will not need a notarised letter of consent. However if only one parent, or somebody other than a child's parent, is taking the child on holiday a notarised letter of consent to travel should always be strongly considered.What documents does a child need to travel without parents UK?
Birth certificate that names only one parent as the legal guardian. Custody papers. Notarized affidavit stating that one parent is absent.Can I Apply as a Parent of My Child Who Has Lived in the UK for 7 Years for Leave to Remain?
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