It started quite simply, wondering how he knew how much his father had in his wallet, it bugged me. I never, ever knew how much my dad had in his wallet. Pondered it for months, discussed it via PM with Maggie, Jane and NGB - but curiosity got the better of me and I asked. It was the only question he didn't answer.
I can look at that from two points of view.
On paper things can appear sinister but have a totally innocent explination
You can argue Jeremy killed his family and then proceeded to rifle through nevills wallet and pocket the proceeds
Or you can argue jeremy could make a rough estimate of what was in there. From going in the wallet himself for example if nevill sent him on the bacon sandwich run, nevill telling jeremy how much was in there, Jeremy seeing nevill. Pull out the wallet, etc etc he was his son