It's a pain to do; remove the undertray from the front of the engine
compartment (if fitted) and lie under the car. Use a torch and a mirror to
locate the fixings and use a ratchet with an extension to reach the top ones
(they're Torx bolts). The upper bolt is a real pain to fit back because it's
deeply recessed and the lamp unit gets in the way unless you've got long
skinny arms. I've changed 3 so far because the lenses keep getting smashed.
Martin

Sounds like fun, that will be my weekend sorted then
Cheers Marti