Answer:
1) Remove two visible socket head with cross head screws from the rear back light assembly on the outside of the car (DO Not Enter or Remove Any Carpets, screws or accessories from inside of the tailgate or boot).
2) Gently pry the light assembly in the direction of the rear bumper (Being careful not to damage paint work in the process). The assembly has two push fit round locating pins securing it to the body of the car.
3) Whole light pops out at the rear and the plastic housing can be unclipped giving access to the bayonet bulbs.
4) Replace bulbs and do everything above in the reverse order.
Whole job takes about 10-15 minutes.