Cheddar, the explanation of how Madge came to be more-or-less running the household worked for me, and explained why her relationship with Joey was so close. There just wasn't anybody suitable they could live with, and it was wartime which I imagine made good housekeepers hard to find. easily pleased, me But like Nell it's a while now since I read it, so I can't defend it in any detail. There were several characters I wanted to know more about, especially the headmistress who was so memorable I can't even recall her name but I liked her at the time, and I'm hoping there'll be other books, including the one where Joey gets ill which must be soon after Home Front ends, so plenty of time to develop them. Have you read Five Children on the Western Front? I re-read that after Home Front got me into a wartime children's fiction mood. It really is brilliant, I think.
Nell, isn't there enough in the Sally Denny library for you? I've scarcely touched it because I never quite know where to start - I only found Margaret Bettany: Headmistress because it was on the front page for some reason. If your favourite CS fantasy isn't there, you could always write it, you know 
Anyone else fancy livening up a gentle Sunday? Does this iteration of the school still have a summerhouse or other suitable venue where we can gather to imbibe the fruits of the staff gin fund fines box? I'll create a distraction by slumping to the ground still, grey and to all appearances dead, and the rest of you can get yourself unnoticed to wherever it is we're gathering. Then once the handsome doctor has departed and Joey has finished singing me back to life, I'll nip out of bed and come and join you. Sounds like a plan?