@bogtrotter , maybe you have had good luck in the industry or I've just had terrible luck, but I know of a few factors/estate managers who seemed to delight in running their employees into the ground on bare bones pay. I experienced this myself.
No surprise that no one stays at those places for long (except the factor of course!), and the excuse 'they could not take the work' is always given to the owner. Not sure how that can be true when you look at the careers that some of those ex-employees have gone on to have, but the line of people naively taking a job there never seems to stop. They advertise nearly every year but the name of the estate is no longer as prominent in the ad (if even mentioned) as I suspect word has spread...
Keep that in mind if you lose your job
Less so about regular hours, more so about fair compensation for time worked.
If you can afford to own an estate, you can afford to pay your employees properly.
If you can't do that, or think estates should not be run at a profit and not a break even/ slight loss, best get it sold.
Aye, but saying "Oh, it comes with the job and they knew full well what they were getting into when they signed up" to the friends/family members/collegues attending a funeral is not the done thing, is it? No matter what industry/line of work they were in...
Personally don't see commercially reared/farmed game birds continuing in the UK for much beyond the 2020's, like it or not. The driven grouse moors have the conservation angle to play, which is very much valid, but I suspect something along the lines of a large increase in sporting rates for land use is going to be implemented in Scotland.
On the other hand, if you are in the right place (Scotland) at the right time, have all the gear/tickets and know the right people, you can run deer contracts from September till the end of March, leaving you time to do whatever work comes between then.
I know a guy who does exactly that, now drives machines during that 'off time' between contracts, who used to be a keeper. What he said to me was: 'Why should I be a glorified chicken farmer for more than half a year (phesants) and rely on tips from guests to cover my expenses when I can earn twice or even thrice as much doing what I do now, see my friends and family, and have more shooting than I could possibly want?!'
I firmly believe that a professional should be paid as one, and some of the wages in the fieldsports industry are already horrific before you look at the hours worked. Yes, the old provision of a house and vehicle, dog+fuel allowance might have meant a reasonable and maybe even a good living a few decades ago when the economy was different (think a few pence for a loaf of bread and under a pound for a pint of beer) but expecting someone to live off less than £30k a year (I don't know any keeper/stalker who gets that!) and run a house, car, provide for a family and their needs, yet somehow have savings, is absurd.
The deer industry in Scotland is going from private estate to privatised contracts with the government/NGO's, yet the future is currently bright, if only due to a spotlight being used

things might go a bit darker with night vision and thermal coming in...