Residual methane in post‑digested sludge is often treated as an operational nuisance rather than an energy stream. In practice, methane leaving digestion in dissolved and entrained form represents a double loss: avoidable emissions and unused biogas. This paper presents results from two UK water utility deployments of Bluemethane Chloe, a modular system that strips and recovers residual methane from post‑digested sludge without major civil works. At Thames Water’s site, Chloe was installed downstream of primary digestion. During the trial, recovered gas stabilised at 20-40% methane at modest vacuum. The energy balance reached 140%, with methane recovery exceeding energy input. Inlet-outlet analysis confirmed a clear reduction in residual methane. Performance was constrained by prior air exposure, which diluted methane content, but recovery remained measurable and material. At Anglian Water’s Cotton Valley site, with thermal hydrolysis pre‑treatment, captured gas stabilised at 60-65% methane. Energy recovered was up to six times the system’s energy demand. Across both sites, results show that residual methane recovery is not a bolt‑on cost but a practical upgrade: reducing emissions, increasing biogas yield, and capturing value currently lost downstream.