Well, I've finally given in to common sense and had a pair of boots made to measure and while my purse took a hit, the knowledge that I shall stride through the next ten years stoutly shod puts a spring in my step and knocks such paltry concerns to one side. In any case, I like to support the artisan where I can.
I went to a local Devon company, Green Shoes, and I can't recommend them highly enough. As a local this meant I could drop in to get my feet measured in person, and they gave me not one but two fittings. When it transpired that the left shoe was, indeed, too tight, they took it away and resoled it without hesitation. It was a very different experience from anything you'll find on the High Street. If you'll forgive the pun, they put the soul back into shoe-making.
In the end, I went for the Dartmoor Boot in chocolatey brown leather with a car-tyre sole (for ease of re-heeling), though the options were many.
I don't know if I've paid off my dues to the cobbler of yore but I'm exceedingly happy. They may not quite be seven-league boots but I'm relishing the thought of walking many miles in their company.