If you lift the boot lid and look at the rear light cluster you will see some screws which need to be removed..the grab hold of the lamp on the curved section and on the flat end ..give a firm pull on the curved end towards you..there is a pin which engages into a plastic lug there which hold the lamp in place..once the lamp is out the rest is simple..here is a pic of the pin and lug..

https://www.2carpros.com/images/external/rearlamplocator.jpg

And the rear of the lamp..

https://www.2carpros.com/images/external/rearlampwirecolours.jpg

Nice work.

Glad to be doing my bit for you guys.without these kind of sites we would be well and truly stuffed ..