I have lived with my partner for 18 years we have 3 children he has mortgage in his name am I entilted to anything due to separation

Depends on your location.

ANY question on law needs to include your general locale as laws vary by area.

I gather you were never married.

Am I entitled to anything on seperaction we live in england

am i entitled to anything on seperaction we live in england

No.;)
The best way for you is to pretend to "common-law-marriage" but I cannot see prospects for success.
The term "common-law marriage" is merely a social usage: the term does not confer on cohabiting parties any of the rights or obligations enjoyed by spouses or civil partners.
/See Probert, R. Common-Law Marriage: Myths and Misunderstandings, Child & Family Law Quarterly vol.20 issue 1 p.1/


i have lived with my partner for 18 years we have 3 children he has morgage in his name am i entilted to anything due to seperation
You are entitled to child support payments .