FAA lists it with Allisons. Seemed relatively quiet compared with the Belgian C-130Hs that occasionally drone over here but sometimes clag seems to muffle aircraft noise slightly. The C-130Js seen to have a higher more insistent sound to my ears.
Speaking of which, an Italian AF C-130J just sneaked past, heading north up through the east Midlands.
And a Dutch Tecnam P.2006 is on survey duty over London today..