They argue that if, over time, Welsh and English policing policy diverged significantly there could be particular pressures placed on cross border and collaborative activity.
Maen nhw'n dadlau pe bai polisi plismona Cymru a Lloegr yn ymwahanu'n sylweddol dros amser, y gellid rhoi pwysau penodol ar weithgareddau trawsffiniol a chydweithredol.