Dame Edna Everage: Farewell Possums?

A fine tribute by Mark Lawson in The Guardian to Dame Edna Everage, who has announced her farewell tour - though Mark suspects it may not be.
In a sidebar, Leo Benedictus suggests her most transcendental musical moment may have been the 1979 single, Disco Matilda.
I have absolutely no recollection of this record, and was surprised to find that, although it didn't chart, it got the dame on Top Of The Pops.
Genius - but then would you expect anything else? 
Enjoy!