Maybe I could borrow a dog just for the walks Sophie 
Welcome @LivingDeadGirlUK. Sounds like you are doing great and the more you do, the more you will want to do if that makes sense. I chop and change my workouts, either because I fancy a change, or more likely because I have injured something
. I am currently doing a mix of dynamic Pilates, strength workouts with light weights (see earlier re: injury) and walking. I am the same as you and walk to/from work 3 days a week, 20 mins each way, and also do Walk with Leslie workouts occasionally. As Sophie said, I love seeing what everyone else is doing and it motivates me to try different things. For instance there have been several posts about yoga and this inspired me to do a 10 minute yoga with Adriene this morning. I am going to try and add in at least 10 minutes of yoga each day.
Today I did a 50 minute workout with Trinny/Nat which they called 'cardiolates'. I enjoyed it and now look like this 
46/200