Brake Lights Not Working

I'm having an issue with my brake lights. I've checked the fuse and the bulbs, all fine. I'm assuming it's not the switch as the brake bar still lights up, just not the left and right lights. Any ideas?

The fuse I checked was the stop lamp fuse near the steering wheel.
 
Have you tried changing either of the bulbs? You can't always tell they are blown and it's not that uncommon for them to both go at the same time.
 
There are fuses underneath the bonnet also

Sometimes fuses blow but they don't look broken, you can check them for continuity

Rule out that and what Ash said before diving into it any deeper
 
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