There's sound, all right! The glorious sound of eight (and later, ten) Merlins in close formation! What a sight that must have been in person!
A comment from the YouTube link, "I can't wait to see the third Lancaster 'Just Jane' (Lincolnshire Heretage Centre, East Kirkby , Lincs) join these two ladies of history when she is rebuilt to flying standards again". Wouldn't that be a sight?