Took off the high level brake light to sort a flashing LED. Turned out to be a failed soldered/ corroded joint on the end LED causing the end three LEDs to flicker. Having read Roger Parker’s excellent book I was aware of the risk of prying it out from the front, so I pushed the cable grommet in and used a piece of flat steel ( screw driver would do) to lever the left hand fixing out from the back. I then cut up a 23mm wide piece of hardboard and slid it in between the light and the boot lid and gently pushed the light fitting, rocking it on the hardboard.