LarryvsHarry do have their own pannier rack which you can get from any UK Dealer
I don't suppose you have any on-the-ground pictures of it fitted? The images on the website are vague on detail. Specifically how the arms are mounted at the rear bridge and the strut on the non-drive side.
@VeloSurMer started
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LarryvsHarry do have their own pannier rack which you can get from any UK Dealer