Hi there your headlight switch is faulty. You have to carefully pull the end off the stalk,you will need a very thin terminal screwdriver to prise it off(there is two spring locators inside be carefull not to lose them as they need to go back in).
Once the end cap is off you will see a little metal contact on the stalk,you have to bend them together slightly while doing this the lights usually flicker but this is normal.
Once you have done this you will have to place the spring locators back on the stalk then replace the end cap over them,usually you will have to turn the end cap so that it is on sidelights position.Once the cap is back on try the lights again and they should now work.
Hope this helps
Ian Watson
May 2008