idk, I think Brits are more individualistic than Easter Euros or Germans, not just n every other walk of life but in boxing too.
They have plenty of robotic fighters.
There are exceptions though from white Brits.
Froch wasn't fluid but he had his own awkward style, not your everyday textbook fighter droid.
Frampton is kinda fluid
Lee Selby is probably the weakest chain among champs in 126 and it's a joke that he calls himself Welsh Mayweather

but he is also less robotic
Tyson Fury is also awkward hell and not textbook but Idk if you count him, cause he is gypsy... A white gypsy though. Interestingly here in Hungary there are many gypsys but their skin in deep to light brown but UK gypsies like Fury and the ones in Snatch are full white
but sure there are many Brits who are robotic I just feel it's less common among them than among Germans or Russians