Air Rifle Hunting Decoying Wood Pigeons With The HW97 Till Dusk

I got a call from a farmer asking if i could help with a problem he was having with wood pigeons attacking his fields of barley as it was all ripe but it would probably take a few weeks for him to finish harvesting it.
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.
Rifle Weihrauch HW97 .177cal 12-13ft/lb
Scope MTC Mamba Lite 3-12x44
Pellets JSB 10.34grain
Range Finder Bushnell Scout 1000
Equifix Dutch Bay
Tactacam 5.0 and FTS unit