Changing / Change a rear bulb / light / lamp on Audi A4

Hi I've just changed a bulb and it is very easy - I have a Audi A4 cabriolet and the instructions were not in the manual! So, to save money and not visit a mechanic, here goes!> Open the boot of the car - locate the plastic flat plug, just behind where the rear lights sit. Turn it half or third of a turn and pull it out. (it's just a cover with 3 flanges - like you get on the bottom of a piggy bank!) In that hole there is a screw - undo it and pull it out - it's quite long ~ 5cm. Now the scarey bit..using your finger nails grip all around the edge of the back light fixture/ coloured glass - and if it's the left rear lamp you are gripping push/wiggle to the left....or the opposite for the other side. You see, the only thing really holding the back light fitting to the car is 2 little balls, which stick out from the back of the car like nipples, and actual light casement is slipped onto these sideways when the car is built. Keep wiggling it very slightly while pushing to left. Suddenly it will come away in your hand. Once off locate the bulb that's blown, #REMEMBER to turn the lights off and remove keys from the ignition!#, Give the bulb housing half a turn to remove the bulb-with-the-socket and change the bulb (remove=quarter turn and extract, replace = push bulb in followed by a quarter turn to fix). Be careful to replace the bulb with the right one - you can read the bulb's description from the metal trunk of the bulb itself---eg could be like - 5w 12v for a rear light etc - get them from Halfords 2x for £2.50. Hope it helps Time for Tea!