Now you know how to recognise the bird you need to find it and go about hunting it.  Wood pigeons are a flock bird, they eat almost non-stop to keep up with their rapid metabolism and they spend many of their waking hours on the ground with their fellows eating the poor farmer out of house and home. 
This is where you come in. 

You are driving home on a summer's afternoon (one the best times of day to go decoying), when you pass a recently harvested field of oilseed rape; as if at a signal the field bursts into life.  One moment there is a stubble field, the next the air is full of grey and white birds twisting and turning as they lift of the field as one.  Pigeons.  How can you get some?

The answer lies in fieldcraft, to be precise in flightlines. 

Woodpigeons arrive, and leave, their chosen field on flightlines and to decoy successfully you need to know what a flightline is and how to find it.  A flightline is quite simply a 'road in the air' which the birds use to get from home to food and back again. 

The woodpigeon sleeps, and breeds, in woods, he feeds in fields and he has chosen routes on which he flies to travel between the two.  Drive to a field on which you have spotted pigeon feeding, sit in your car on the edge of the field with a pair of binoculars for half an hour or more and watch.  If the birds are using the field you will see traffic, birds coming into and going out of the field. 

Pigeons like to fly and they usually fly, and decoy,  better in a wind; the prevailing wind in this country is from the South West.  Study the wind, look for staging posts along the line that they use, single trees in the field, hedge lines, streams, farm tracks etc.  The lines are really just like roads, they have cross roads, corners, junctions, lay-bys and so on. Once you have established the line that the birds are using you merely have to build your hide under that line and go decoying. 

The logic behind this piece of fieldcraft is easy.  If you don't do your reconnaissance and merely build your hide on the field where you have seen the birds feeding you will scare them away when you approach to construct your hide, and you have no way of knowing if they arrived to feed haphazardly in that spot or that they chose to be there. 

If, however, you have watched the field and you build your hide under their flightline into that same field, you know, even if you scare them away when you start shooting, that when they return to feed (because you have attracted them with your decoy layout),  they will all fly along the flightline.