Which bulb do I need to replace my brake light?

[electric_cooper]

Hey guys

Had the warning light come on the DIS yesterday confirming that my Drivers Side Rear Brake Light bulb had gone?

Can anyone tell me the code/size/pin or make/model of the bulb that I need to buy to replace it, going to nip into my local motor factors tonight.

Thanks

 

[warren_S5]

Audi call it a 21W, but it seems known generally as a 382.

Here is an example of one: link