In much the same way as the Gloster Meteor is credited with saving us all from the V-1 scourge radar gets all the glory for the Battle of Britain. The fact that it was one aspect of the world's first integrated air defence network is always forgotten, as is the fact that once the raiders had crossed the coast there was no radar at that time. Step forward the Observer Corps, but many books on 1940 barely mentions the organisation, and never acoustic mirrors.
I seem to recall that there is some kind of acoustic sensor from WW2 still standing on Malta as well.