Possible Clues:

• Novel about middle-class people
• Novel about middle-class people in the shires
• Commander's commander in sort of novel that could go either way?
• Work filling bag as a gardener
• The Ottoman commander most admired by his peers produces middlebrow novel
• Novel of middle-class life written in rhyme
• Story concerning the English middle classes
• Palindromic name for a novel in a semi-rural middle-class setting
• Book doubly a laugh? Not quite
• Generic name for a novel about middle-class people in Britain's shire counties