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The passenger side rear tail light doesn't work so I thought it was a dead bulb, so I went and got a new one today and it still doesn't work. The shop tested it and they discovered the bulb still works so I swapped it over with the driver side light and it worked fine. The brake lights are also fine.

Its obviously the electrical wiring that's causing it then but I'm not good at electrics, can someone explain how I might be able to fix it?

Check the earths. They are bolted in behind the carpet on each side

What should I be checking for? I'm really not good at electrics at all.

Turns out its not the electrics, I was actually checking the wrong bulb! I was testing the 2nd one down which isn't the tail light its the 3rd one down which turned out to be a blown bulb. D'oh! Lol.

I'm impressed you owned up to it!