This is a really interesting piece of scholarly detective work!
I've now just bought a v. cheap 2nd hand copy of 'Sex in Georgian England' (it's my sort of 'field') for sharp-critical-knives schadenfreude purposes-- from Amazon out of academic curiosity. I noticed in the: 'customers who bought this also shopped for' section that 'Oxford: The Novel' has A.D. Harvey listed as the author, not 'Leo Bellingham'.