when woodies attack

[Doves in the city]

i have recently homed 4 doves but have a very large colony of wood pigeons less than 400 yards away, [ten birds to date], who got on with my chickens in no time at all, stealing their food etc. however i have my doves under a net who seem quite at home [fingers crossed] but the woodies are not only interested but constinatley keeping vigil. and making their presence very much known, are they just being nosey or could my doves see them as a threat? i live in the middle of london so pigeons are everywhere, however i realised that i have never seen a rock dove in my enclave (which is around 700 meters by 1000 meters and all gardens)