can any one tell me where abouts the brake fluid reservoir is on octavia 2001 1.9 tdi ambiente

From the front of the car: It will be at the back of the engine bay near the firewall, to the left of the bay behind the engine. It is below the level of the top of the engine.

HTH

Assuming it's right hand drive

Assuming it's right hand drive

True - but it was a sensible assumption.