Lowering the Fascia Panel: Remove the bottom 2 screws then pull down the 2 green latches at the bottom of the boiler and push the panel downwards then carefully lower down. Take care not to damage the pressure gauge capillary tube or electrical connections.
Case Removal: Remove the two screws below the combustion chamber, undo the 2 catches at the top of the boiler and slide the case off forwards.
Lower Panel Removal: Unscrew the three retaining screws underneath the appliance then gently slide the lower panel down.