Found via group I’m in, felt it useful to share 
Try these guys, they’ve been producing leatherworking tools since 1836. Still in the same family.
https://www.georgebarnsleyandsons.co.uk/about-george-barnsley-tools
Urban exploration of their old premises!
https://www.bcd-urbex.com/george-barnsley-sons-cornish-works-sheffield/
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Have to add a shout out for Le Provo Leathers for tools and sundries, as well as hides. If nothing else, the website will be a journey in to an earlier era!
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Also GH Leathers
The basement in the shop is great for a rummage, but for now, use website (though I think I got a better deal for postage when buying via their Etsy shop instead).
Additionally, @stochastic_forest is this useful?
Could use some of that thonging?
Possible event/kit potential apart from attaching the snaps.