Hi Prakel and Greengage,
I understand there are incentives for leaving headlands in some counties and some farmers have proved the benefits from attracting pollinators onto their land. Higher yields and so on. But for wind pollinated crops there is no such benefit so most farmers don't bother. I'm still sussing out forage available and thus far it's not positive - my first year at this location. I think your list of negatives Greengage, is about right sadly. I guess as very busy people farmers have every right to consider headlands and so on as unnecessary distractions.
I intend to get into raising my own queens but am still a novice with much to learn.
Today my neighbour has a swarm high in a tree and the scouts are investigating my bait hive, so I'm hoping tomorrow they'll move in and I'll be back to two colonies after losing the one robbed out.
I appreciate your comments.