These are the only engines that do it. XM 607 the 1st Falklands bomber had Olympus 301's which didn't it's only the 201's in the B2 shape like XH558 that howl.
As to why I haven't got a clue but when she does it sends a shiver down your spine.
Oh and they are completely different engines to Concorde. No reheat, etc but only just the same family. They tested Concordes engine design by strapping them into the bomb bays of Vulcans.