I have exactly the same boots, they are brilliant, I got them made to measure by calling in to the factory in Richmond as I was on my way down to York university.
I went for the wide fit this time. I've got their walking boots and found that the wide fit made a big diference. Wide fit is made to order.
If you visit the factory they can also make adjustments for instep and calf size.
If you've got really weird feet they can do made to measure, but it's upwards of a grand
, unless you already have your personal last held at the factory from a previous order which will save you about 500 quid.