I'm registered with one agency and they're asking me to take it, online (it'd cost me £12, they pay the rest). Has anyone taken this course before? (takes about 2 hours by the looks of it, with questions at the end). They're saying that not having this certificate may limit or stop me from getting some work/assignments etc., although I've worked in about 15 schools in the past year and no-one has ever mentioned this certificate to me. What are your thoughts on this?