Kilted Ginger

Yes i know its a strange request but i've had a look on the web and cant find chimneysweep.org/forum.

I've got a birds nest in my unused chimney, can hear the little blighters twittering away, I'm going to buy a cowl and get up on roof to fit it but how do i get rid of the birds and their nest.

1. tie a brick to a rope and drop it down the chimney and smash the nest to bits and pick it oout the fireplace?
2. start a fire in fire palce and hope the smoke drives the birds out before their nest catches on fire.
3. call a professional and pay through the nose.

Oh its a newish 2 storey house, fires never been used.