There's a useful quote from Robin Walker in here:
"Robin Walker, the head of the Commons education select committee, told the Telegraph it was “absolutely legitimate” for schools to discuss LGBT matters, but they must be “sensitive to the views of parents” and not go “beyond what most people would see as reasonable”.
He said: “One of the concerns we’ve heard widely is that there is a threshold but no ceiling as to what needs to get taught. It should be age-appropriate and discussed actively with parents. It sounds in this case like a school going well beyond that and of course that is a matter of concern.
“It’s an example of why greater clarity is needed in the DfE’s guidance on relationships, health and sex education (RHSE) and that’s very much something that the select committee has been pushing for.”"
SSUK quoted too, the point about suicide is a serious one:
"Tracy Shaw, from the parents’ group Safe Schools Alliance UK, said: “We are not sure where to start with this school’s celebration of Pride. Drag is a form of adult entertainment largely performed by men and its suitability for children is widely contested.
“We are extremely concerned that a drag queen has been invited to talk to children about suicide. There are strict guidelines in place for discussing suicide and no-one without specific and rigorous safeguarding and mental health training should be talking to children about the topic.
“Once again safeguarding has gone out of the window as the school appears to be more interested in demonstrating how ‘inclusive’ they are rather than thinking about what inclusivity means.”"