'Astonishing': Octopus Energy and Scottish Power in zonal pricing row / Martin Lewis issues 'act today' alert to anyone with E.on, OVO and Octopus Energy / Octopus, British Gas, EDF and OVO customers with boiler could save PS100 this summer / British Gas, EDF, EON and Octopus customers urged to make PS258 change before July / Octopus Energy told to pull 'misleading' energy switch ads after British Gas complaint / British Gas, EON, Octopus, EDF and OVO customers issued PS237 freezer message / Octopus Energy issues 'act now' message as customers to be cut off / Octopus and its customers ask Treasury to back zonal electricity pricing / Octopus Energy hits back at wind firms' 'untenable' attack on zonal pricing / British Gas, Octopus, OVO, EON and EDF customers told to unplug 5 appliances as bills rise