As a member on a few of different forums, LED's and bulbs always seem to cause massive confusion
The info everyone had posted already is excellent so for anyone who's unsure, the GTI/GTD come standard with LED DRL's, footwell lights, fogs, puddle lights, interior, rear and number plate bulbs.
The bulbs that you may wish to change (and links to suggested upgrades) are:
Static cornering lights - H7 -
http://ebay.eu/1k8ITWyReversing lights - H21W -
http://ebay.eu/1jFFsUd Front indicators H21W - same bulb as reversing lights but need to be very bright for safety/visibility. Above bulb will work but some owners report that they are not as bright as original. I found these on a French site and might give them a go but they are extortionate -
http://bit.ly/1gTmPvbVanity mirror lights - Festoon 38mm LED -
http://ebay.eu/RO8Xx4Glovebox - 501 also known as W5W LED -
http://ebay.eu/1lId8aOBoot - Festoon 42mm LED -
http://ebay.eu/1ro6DXTThanks to Croz13, Monsta & Aidey for some of the above info.