I read somewhere that the protests had spread to five other schools in Birmingham, including one which was
not using the "No Outsiders" program, but also that there were protests further afield in Lancashire. That seems to be confirmed by this report:
https://schoolsweek.co.uk/birmingham-headteacher-says-unclear-dfe-guidance-has-caused-lgbt-protests/
Incidentally, there was a protest against the perceived promotion of homosexuality in Bristol over ten years ago. The school solved the problem by "temporarily" withdrawing the materials in question and was began liaising with various groups to ensure that the topic could be addressed in an "inclusive manner". (I wonder how the liaising went.)
Parkfield has followed the same course, suspending the "No Outsiders" program and promising further "dialogue" with the parents on the issue.