2009 R56 Cooper S Interior Dome Light
 

Hi all,
I need to replace the bulb holder within the rear interior dome light, the one behind the front seats, not just the bulb, but the whole bulb socket.
Does anyone know how to remove this lamp assembly?
I have got as far as popping off the plastic cover and removing the single bulb, but cannot for the life of me work out how the lamp assembly comes off, I don't see any torx screws, nothing!
Any ideas would be greatly appreciated, I certainly don't want to cause any damage trying to force it off!
This is inside my 2009 R56 Cooper S, the rear interior dome light assembly.
Many thanks.