I've been through Halton fairly recently (in the last couple of years) and take advice from Nancy Sinatra. Those boots are made for walking. Through Halton you will do some boot walks, but you will not be running for any real length of time in them.
I wouldn't wear two pairs of socks with boots. They don't stop blisters, they are just something else to rub and blister your feet. A good solution is Zinc Oxide tape over the area that gets blistered. NOT, for the love of god, on any pre formed blisters. This provides a surface for the boot to rub against without actually rubbing the skin of your foot.