It must have come as a bit of a surprise to Andrew Gant to find himself compared to Josef Mengele. That’s not how composers, choirmasters and Lib Dem councillors — Gant is all three — are normally regarded. But this was 2023, Gant was also the cabinet member for transport management on Oxfordshire county council, and the council’s low traffic neighbourhoods (LTNs) were so contentious that in an email to councillors a local hotelier said that “Gant, along with his associates” were “experimenting” on the city as the Nazi doctor did on concentration camp victims. He later apologised. LTNs were...