Leaving the decision to invest in hydrogen for heat later than the mid-2020s would bring considerable risk of limiting its potential role. This is because there is a likely need for both major construction and operation of new infrastructure. Therefore, we intend to make strategic decisions by 2026, including whether hydrogen is safe and feasible to use as a heat source and the key enabling steps required. More broadly, the action we take in the 2020s can be used to test and evaluate different approaches to decarbonisation. This will inform our evidence base, from which we can develop new policies and make informed decisions regarding the best pathway to Net Zero. We need to start the transition now to meet our emissions reductions targets cost- effectively, minimise disruption and maximise benefits for everyone.