Custom Bikes Seen in Skipton

They're rebuilds on old frames, registered as tax exempt/historic, there's a distinct similarity between them, but they're far from identical, I'd guess them to be the work of the same person or workshop. I like the red one more, with its open forks and (argh!) leaf spring front suspension.
Although the red bike's tank says "Ace", the only "Ace" bike I know was a straight, inline four, not a V-twin, the company became "Indian" far back in the mists of time. If any passing reader knows more about these two, I'd really be interested to know, If you're the maker, my hat is off to you.