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Came across the text below online (vwpartsvortex.com). Looks like I can rule out the switch (3rd light works), and the indicators are fine so it's a fuse or two bulbs. Wouldn't expect both bulbs to blow at the same time, so would the flashing only start when the second bulb blows maybe? Meanwhile left it with the garage to scan the code........
Brake Lights Out, Third Light Works
You can rule out the brake light switch if your third light is working but the brake lights are not. Check the emergency lights to test the wiring, lights and sockets. If the flashers work, then test for a blown fuse.
If your Volkswagen uses the same lights for the turn signals and the brake lights, you may have a bad turn signal switch that is causing the lower brake lights to stop working. A bad turn signal switch will not affect the third light.
With this type of system, the turn signals use the same circuit as the brakes, which means that you cannot have both of them on at the same time. If the turn signal switch is bad, it can interrupt the brake light circuit. It can also be a broken wire on the switch that is causing the lights to stop working.
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