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The O/S tail light shares the same fuse as the O/S side light. If the O/S side light is working and you are sure that the bulb is OK then it must me a wiring / poor connection fault.
I would start by swapping the tail lights left to right just to confirm the bulb. If the O/S is still not working, I would take a good look at the connection to the rear light clusters, sometimes just unplugging and reconnecting the connector can sort things out. Also take a look and see what the contacts in the bulb holder look like, if they look 'fury' give them a clean with some fine grade paper to see if it works.
Failing that, you may have to start looking around with a multimeter to see if you can find a wiring fault.
BTW... The fuse is F7A (7.5A) located in the engine multiplex module (not the passenger compartment fuse box)
Currently in martin999's garage:
2011 (11) VW Passat 2.0 TDi SE + options in Island Grey, 2011 (11) Honda CB1000R in Pearl Cool White... oh and a 2004 (54) Secnic II 1.5dCi Dynamique in Ottoman Blue !