I have a blog but I never mention work. Like yours its mainly about health and fitness. And totally anonymous- no pics of me or my name...mainly because Im not ready for my friends/family to see and read it. I would tell your Head. Do not apologise for its content though- you are free to write about what you want, how you want, provided you are not bringing the school into disrepute which I doubt you are if you have not mentioned its name, the name of the staff or the children. Tell him/her you have a successful blog that you run on the side and you are only mentioning it as due to your success you will be featured in a magazine with a photo and full name. Tell him/her that as any parent who may see it may decide to look up the blog you wanted to let them know in advance as we all know "how parents can be". I'd give him/her the link to the blog, explain that you will not be telling other staff as its a personal hobby and where possible you wish to keep work and home separate. Thank them for their time and scoot. Finally, a HUGE well done on being so successful blog wise and getting into as mag! You must be so proud. Are you a huge blog follower? I can't get by without my daily fix of The Fitnessista, Ali on the Run and Sweet Tooth Sweet Life among others! If you like UK blogs you should check out http://sweettoothrunner.com/.