Gratifying that the Karrimor brand does well as I bought a pair without much knowledge of the subject a while ago, mainly because I recognised the brand as one that made saddlebags, and the price was sane. I did not recognise any of the other brands, and they all seemed to be made in China anyway. They have been fine, and I walk the dog about a mile or more every day through forest (including wading through undergrowth), wear them about two hours a day in the garden, and also for all exterior house and car maintenance.
One point though : I have frequent garden bonfires, and found that if any sparks fall on cloth parts of boots (and cloth inserts seem to be in fashion) then the sparks burn a hole. I therefore keep to all-leather boots.