I agree Thesilverypussycat! A few more equine tales/tails would be good! 
I must say I love the portrayal of Freddie, even though I don't always love certain aspects of his character! 
And gosh, I feel very honoured to receive Boops, thank you 
Ppeat yes, liveries are expensive and that's after shelling out anything from about four to twenty thousand pounds for a good hunter. It depends on which part of the country you are in, but a full livery could be approx £150 a week and around £200-250 for a full hunting livery which includes all the prep, transport to and from the meet, second horses etc). You can also make money out of "hirelings" for people without horses who go out for a day's hunt now and then.
I don't think it is clear how many horses Shula has in her care is it? I think they keep it deliberately vague. But there are at least ten I would have thought if you count the mounts of the various characters plus a few more hunters. She couldn't survive on that income alone with so few though I would would have thought?
Most horses eat 2.5% of their bodyweight daily. If you consider a 16h hunter weighing 480 kgs or so will eat approx 10 kg of forage a day (22 lbs) plus scoops of hard feed (more in hunting season), plus chaff it all adds up!
Wages for grooms are low (in fact recruitment is so difficult atm that there has been an industry-wide drive to raise them across the board) and you will have arrangements where people earn rides by volunteering to help. But that is happening less often nowadays owing to insurance regulations and risk of injury etc.
Anyway, the cost of tack, feed, veterinary care, dentistry, farriers, transport, field maintenance (harrowing and re-seeding in some instances) and fencing are all high and most people do not make huge profits. Unless you are breeding very top end race horses, you don't do it for the money, particularly given the long hours involved in all weathers. It's more of a vocation I would say.
I need DadDadDad to construct a spreadsheet!