Grangers or similar vs Dubarry cleaning and care products for Dubarry ultima Leather (Goretex) boots

Mink oil, not even sure whether there's any actual mink oil in product labelled as such but use it to keep leather motorbike and walking boots supple and waterproof. I think it does a good job, don't use anything special to clean them, i.e. warm water only as required...
 
Tell me where you buy Grangers and I will give it a try -my dubarry boots need a new heel as current one has rotted so inner core structure showing but maybe a polish first.
 
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