National Union of Teachers www.nut.org.uk

The NUT provides three guidance documents on tackling homophobia in education:

Tackling Homophobic Bullying: An issue for every teacher

Negotiating for Equality

Supporting, lesbian, gay, bisexual and transgender students (856 kb)

NATFHE www.natfhe.org.uk

The University & College Lecturers Union has issued a joint policy statement on equality for LGBT staff and students:
www.natfhe.org.uk/down/lgbtpolicy.doc

NASUWT www.teachersunion.org.uk

NASUWT has a number of advice documents on sexual orientation and homophobia:

Tackling Homophobic Bullying – NASUWT Policy, Advice and Support for Teachers

Homophobia? “it’s a crime, any way you look at it!” 
 
Employment Equality (Sexual Orientation) Regulations 2003

They also have a section for Lesbian, Gay, Bisexual and Transgender Teachers.