Check out these other LOL sites
Botia rostrata Image Search — Loaches Online look hard at the semi-adult &
Botia kubotai - Development of Markings During Growth — Loaches Online
Lalo, again, what size is your mystery loach? Your first pic showed orange-y fins & yellowish background. That could be a trick of lighting or camera...I don't know...
Sprinkle is in the UK & they can get so called "czech bred " loaches that are often hybrids. We in the new world are much less likely to see them, thank goodness!
I really think you should join loachfantics FB group & see if some of the real experts know, not just us well meaning guessers
but you'll get those too there. Post up all your pics & its size too. & keep in mind it's the holidays for many & it may take some time...