Increase your activity levels

Someone who increases the amount they exercise, but maintains the same diet and calorie intake, will almost certainly lose weight. No matter if you hate gyms - even light exercise such as a short 20 minute walk will be beneficial if done most days of the week. Every single time you exercise more than usual, you burn calories and fat.
There are lots of ways to increase the amount of activity you do. Team sports, racket sports, aerobics classes, running, walking, swimming and cycling will all improve your fitness levels. Find something you enjoy that's easy for you to do in terms of location and cost. You are then more likely to build it into your routine and continue to exercise, despite inevitably missing the odd session through holidays, family commitments, etc. Get out and about at the weekend. Leave your car on the drive and walk to the shops. Try to incorporate longer walks into outings to the park, coast or countryside and take a picnic so you are in control of what you are going to eat that day.