Air Rifle Hunting Wood Pigeon Decoying Over Cut Silage

I was asked by a farmer earlier in the year if i could help with a bird problem as his crop of barley was nearly ready for harvest and the wood pigeons and corvids were hitting it hard so since this farm is usually shot over every Saturday by other shotgunners i decided to try decoying it in the evenings when it was quieter.
This is all done on farm land that i have permission to do so on with legally held air rifles and is done in a legal and humane manner as not to prolong or glorify the death of the birds.
This can legally be done through the Department Of Agriculture, Environment And Rural Affairs Wildlife (Northern Ireland) Order 1985 (As Amended) Licence.
This Licence hereby authorises for the purpose of preventing the spread of disease and preventing serious damage to livestock, foodstuffs for livestock, crops, vegetables, fruit, growing timber and fisheries ANY AUTHORISED PERSON to kill or take any of the following birds:-
Crow, Jackdaw, Magpie, Pigeon (Wood), Pigeon (Feral), Rook, Sparrow (House), Starling.
Range Finder Bushnell Scout 1000
Rifle BSA Super10 John Bowkett Blueprinted .22cal 15ft/lb
Scope Nikko Stirling Targetmaster 4-16x44 LRX
Pellets JSB Diabolo Exact 15.9 Grain
Tactacam 5.0 and FTS unit
The Double Bush pop up hide