Childermass v. Lascelles ~ I’ll just read a book instead

In Which Mr. Childermass (and Others) consider that Mr. Lascelles is shady. AU in which JSAMN is a rom-com? Thanks to VeryNonspecific on Tumblr, who reminded me of this song (Doo Wah Doo - Kate Nash) in her ’Mapp & Lucia’ video “I’ll Just Read a Book Instead“... I thought it worked for my purposes, anyway. :) Fair entertainment use, own nothing, Susanna Clarke & the BBC, etc.