WW1 Era Officers Leather Trench/Riding Boots

Here are a good pair of WW1 era brown leather Officers trench or riding boots, they appear from what I have seen to be a bit different to other pairs for sale as they are fully laced from top to bottom with no other straps or catches, there are no makers marks and they have been well used, the top leather is still supple and the boot rigid, they would benefit from a good clean and a feed to the leather, they should shine up very well, I estimate them to be around a size 7 or 8.