Xenon bulb replacement

Hello chaps I have recently purchased a well looked after 06 197 in black, i noticed today that i have a front headlight out. It is fitted with xenon headlights and luckily for me it's the drivers side that has gone so no need to remove the bumper.

I can access the bulb no problem but can't seem to remove the bulb. I states on the back of ballast to twist to the left but not sure if there is another clip or just case of a bit of gentle persuasion is needed. I have search the how to section with no info on the xenon's