Green tea, peppermint tea, sugar free cordial, lots of liquid to distract you from being hungry
snack on fruit and veggies, a bowl of low fat/sugar cereal with skimmed milk is good if you're really starving, and try and eat plenty of lean protein as it keeps you full for longer. Try not to eat too late at night especially carbs although I know that's hard when your life is busy busy! Aim for your diet being 1/2 fruit/veg, 1/4 lean protein, 1/4 carbs. Make your own fat free veggie soup and keep it in the fridge so you have can have a snack ready in 2 minutes. Try to have smaller portions, chew properly and only go for seconds if you're still hungry after 20 minutes. Cut down on alcohol *sad face* ...'bad' alcohol anyway, nobody takes away my white wine and gin 'n' slims!
Can make you a bit obsessive but you could try writing down everything you eat, as it 1) makes you notice what your weak points or bad habits are, and 2) kind of works as a deterrent as it's pretty depressing to add '... 4 Krispy Kremes, a family size tin of Quality Street and the remains of OH's packed lunch' at the end of a day of trying to be good!!
Exercise wise it sounds like you're doing a fair bit with the horses but can you go for a jog or brisk walk at lunchtime? Can you walk or cycle to work or to see the horses instead of driving? (don't know if you drive just a suggestion). Could you squeeze in 15 minutes of skipping on a rope (fab exercise!) first thing to get your metabolism going?
Good luck, a stone isn't much to lose, I have also today commenced a modest regime attempting to shift a few pounds that have crept on over winter and refused to go away! Spent the afternoon researching lunchtime bootcamps, god help me!!!