Sorry you are in this situation. There is no way except to do the sums in detail. Don't forget that if the DCs are his he will still be financially responsible for them. You will also need to include childcare costs and "guess" how much time he will have the DCs. I take it you have to move out with DCs rather than stay and him find alternative accommodation.
Most of these links were posted by Offred elsewhere...I found them very useful:
Married or Living Together?
This is a key question, because if you are married, generally speaking you have greater protection when a relationship breaks down.
Legal Issues around marriage/cohabitation and relationship breakdown are explained here:
//www.adviceguide.org.uk/england/relationships_e/relationships_living_together_marriage_and_civil_partnership_e/living_together_and_marriage_legal_differences.htm#Ending_a_relationship
//www.advicenow.org.uk/living-together/
DirectGov advice on divorce, separation and relationship breakdown:
//www.direct.gov.uk/en/Governmentcitizensandrights/Divorceseparationandrelationshipbreakdown/index.htm
Legal Rights and issues around contact are further explained here:
[[www.rightsofwomen.org.uk/legal.php#children_relationship_breakdown
www.maypole.org.uk/]]
These guides from law firms quite informative and easy to read ? there are others of course:
//www.family-lawfirm.co.uk/uploaded/documents/Surviving-Family-Conflict-and-Divorce---2nd-edition.pdf
//www.terry.co.uk/hindex.html
Finance
Before you see a family law solicitor, get hold of every single piece of financial information you have access to, and take copies or make notes. Wage slips, P60s, tax returns, employment contracts, pensions and other statements ? savings, current account and mortgages, deeds, rental leases, utility bills, council tax bills, credit statements. Are there joint assets such as a home, pensions, savings, shares?
CSA maintenance calculator:
//www.csacalculator.dsdni.gov.uk/calc.asp
Handy tax credits calculator:
//www.hmrc.gov.uk/taxcredits/payments-entitlement/entitlement/question-how-much.htm#7
Handy 5 Minute benefit check, tax and housing benefit calculators:
//www.moneysavingexpert.com/family/
CAB Benefits Check:
//www.citizensadvice.co.uk/getadvice/benefit-calculator/A2B-Benefit-Calculator/#730
Parenting issues:
[[www.familylives.org.uk
www.theparentconnection.org.uk
//Housingwww.england.shelter.org.uk/get_advice/families_and_relationships/relationship_breakdown
Children their welfare, needs and interests are paramount.
get word of mouth recommendations for family lawyers in your area if possible. As you have children at school, ask around for a recommendation in your area. ? there?s a lot of knowledge and support out there!
Many family lawyers will offer the first half hour consultation free.
You can read advice and search by area for a family lawyer here:
//www.resolution.org.uk/
You will also read good advice and find a family lawyer here:
www.divorceaid.co.uk/
You will be encouraged to attend mediation. This can help by encouraging discussion about arrangements for children and finance in a structured way in a neutral setting. However, it only works if both parties are willing to reach agreement.
If there has been violence or emotional abuse, discuss this with your solicitor first. Always get legal advice, or at the very least make sure you are aware of your legal rights, before you begin mediation.
Best wishes