Rob says
The ‘Service Required’ warning displayed between the speedo and tacho can be reset. With the ignition switched off, press and hold the rear fog-lamp button, then switch on the ignition and release the button. Press and hold in the tripmeter button, then press and hold in the rear fog-lamp button (both buttons should now be held). Wait for a reset service message to appear on the instrument display, but keep pressing the two buttons until a service mode reset message is displayed.