Landrover Discovery 11 Engine KNOCK - HELP !!

A quick vid to let a few learned guys see and hear what they think is causing this knock ? Engine has top hat sleeves apparently FITTED at the last re build only 40K ago .... runs great , no smoke , clean oil , no bubbles in the radiator header tank water .... oil light goes straight out no probs ... a local mechanic ( not landrover savy ) called it straight up without looking for anything else as a bottom end failure ? any help would be appreciated :- ) cheer Steve