Whatever you do, don't stop it completely, I made that mistake when I had to quit the gym as it was becoming a bit expensive for me as I had to travel with the car and back, with membership on top of that.
Once I stopped, I went back to my normal way of eating, also me working 4-5 times a week certainly hasn't helped compared to the 2 days I was doing before. Working an 8 hour shift or more ruins your diet, especially if like mine it's 3:30pm to 11:30pm.
It's not that hard to cut out snacks, just replace them with healthy ones. Instead of a chocolate bar, get a Weetabix bar, instead of McCoys crisps, get one of the lighter baked ones that you can now find. Innocent smoothies can be helpful too, as 250ml worth counts as two of your 5 a day,
I used to go to the gym every week and do three 10 minute bursts on the bike, and then some lightweight training, and then 25 minutes or so on the treadmill, not an intense workout but good enough,
Whatever you do, try and drink plenty of water, not only does this help you feel full and eat less, it has no calories.
People have different systems to lose weight, pick one which that suits your lifestyle. Or you can create your own, it's what I did randomly after messing around in the gym for a couple of weeks.