Clarks is the obvious. They go up to a 13 I think.
Went there. They did have bigger sizes but nothing all black.
8 on their website
https://www.clarks.co.uk/Mens/Black-Shoes/c/m106?q=:relevance:sizeGroup:adult/13&sort=relevance#page=1&pageSize=24&productIndex=20358122
@hippy started
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Clarks is the obvious. They go up to a 13 I think.