anybody busked in madrid recently, could you list any pros and cons (ie police etc) i will be performing with fire.

What's busking? If you are juggling, or doing anything with fire, the polica will bust you for busking! That is something you DO NOT want to have happen. A huge polica will sit on you until the car arrives to take you away. I am not kidding. They actually do that.

I met a fire juggler in downtown, he said he had to keep a careful eye out (how he did that without losing sight of his flaming torches I have no idea).

Tengo cuidado,
Martín