The majority of London's primary school teachers think they can not talk about homosexuality in the classroom.
A survey found only 11% of teachers knew they could discuss gay issues, such as same-sex parents, in front of children.
The polling by Stonewall reveals primary school teachers in London are significantly less likely than their peers across the country to know whether they are allowed to teach about lesbian, gay or bisexual issues.
It found 35% of teachers in Scotland, 29% in the rest of the south, 24% in the north and 22% in Midlands and Wales, knew they could talk about homosexuality.
Speaking to ITV News, the Education Secretary Michael Gove accused teachers of going on strike only because many oppose performance related pay, which would see the best teachers paid more.
The Education Secretary, Michael Gove, wrote to both teaching unions in March to say he was willing to meet them to discuss their dispute. But he also insisted that the "direction of travel" on two of their key issues - pay and pensions - was "fixed".
Today, Michael Gove said: "The picture these union leaders paint is of a profession which no-one rational would wish to join - a profession which is unattractive, unrewarding and unfulfilling.
"The truth, however, is very different - teaching, as a profession, has never been more attractive, more popular or more rewarding."
Teachers in London will walk out on strike on October 17, with a second day of action expected to follow before Christmas. The action is being taken by members of two unions, the NUT and NASUWT.
Teachers at Copland Community School in Wembley staged their second strike today against the proposed imposition of academy status.
Teaching staff and supporters then marched on Brent Civic Centre, dumping an effigy of Education Secretary Michael Gove in the 'dustbin of history' to loud cheers.
Footage was taken by Martin Francis:
A crisis-hit school was closed today by teachers striking against plans to turn it into an academy.
Teaching unions from ATL, NASUWT and NUT at Copland Community School in Wembley called upon the Labour led Council to stop assisting Education Secretary Michael Gove's forced academy programme.
Teachers and lecturers from across London will be going on strike tomorrow, in a row over changes to their pensions.
Members of the University and College Union and the National Union of Teachers will march through central London before holding a rally outside the Education Department in Westminster.
A map of the proposed route can be seen here.
London Tonight would like to hear from you if you're likely to be affected by the strike. Get in touch to share your views at firstname.lastname@example.org