When I did the walk in 2015 I invested in a pair of Merrell Moab Mid GTX boots. They were great, light, comfy and waterproof. Sadly they are getting a bit past it and based on recommendations I went to Breaking Free in Farnham to have a look at Alt-Berg boots. These are UK made, and their models are standard issue for MOD, Police and the like. I settled on a pair of Yan-Tangs as they just felt right straight away. A kevlar/nu-buck mix so very light and also waterproof. The first walk in them was supposed to be about 4 miles. 16 miles later I returned home with zero problems. Great boots.
Time for new boots