Answering the questions above:
I am walking with an aim to get fitter and in doing so to lose the weight.
The way I'm motivating myself is purely that my workplace is a good 30-35 mins away from where I live, so instead of getting the bus I am walking, plus most days doing some shopping too in the town first, so the overall walk is often about 45 mins or maybe more.
I'm walking at a reasonable pace but not power walking or going too quickly. I'm definitely not doing a leisurely stroll. I'm breaking into a sweat after about 15 mins or so but I find my breathing is quickly settled once I stop, so I think I must be doing reasonably well. The first time I did it it took me longer to recover my composure than it does now, so something's working