I agree with Dragonchilde - it broadly sounds like you are getting enough exercise for general health purposes, and reasonably well balanced between ST and cardio.
But exercise isn't just about how long, it is also about quality.
For strength training, it is possible to use challenging compound exercises (that work several different muscles simultaneously) to get a very effective workout in just 20-30 minutes. Or you can throw light weights around with isolation exercises for an hour and not achieve very much.
Equally with cardio, you will get far more benefits (both in terms of heart health and fitness, and in calories burned) through more intense cardio that gets your heart rate higher. Walking is a fairly moderate exercise, although it's pretty good for people who are just starting to exercise. But as you continue to exercise regularly, you probably should seek another form of exercise that gets your heart rate higher. I've never done a Leslie Sansom video, so I can't really judge how intense it is, but the "Advanced" sounds good.
Also, in terms of 'enough' exercise to lose weight. For most people, weight loss is 80% nutrition, and just 20% exercise. There are 3500 calories to a pound of fat. If you are burning 600-700 calories per week through exercise, that contribution is small, but useful. If you looking to burn more fat through exercise, you probably need to add to your cardio - either through quality or quantity, or both.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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