I linked to that YouTube clip in my subsequent post, Jim! 😄
It's a new one on me, never heard the expression 'Estuary Emglish' before. As a description of an accent, it makes no sense, of course - there a lots of estuaries around the British Isles, the accent of the (Humber) Estuary English (my local) is very different indeed to the (Thames) Estuary English in that clip, and the (Clyde) Estuary English is different again.