Geoff,

Do you mean Harry Downing.?

Yes it was Harry Downing he played for the Dons in the late 1970's & later he owned a Gents Hairdressers Shop in Copley Rd the shop was called Flash Harry's

Answers to the clues
The first two words in the Lightning Tree song were Down In
The household cleaning product which was part of the shops name was Flash

Can you name the New Zealand born & former Featherstone Rovers player who signed for the Dons & played just one first team game & then returned back home to New Zealand?

Clue
His one and only appearance for the first team was as a substitute in the home Regal Trophy game in 1992 .

Clarry Iti

That's the correct answer.

Can you name the former Huddersfield captain & temporary assistant coach who played for the Dons?

Greg Shuttleworth ?

Correct .

Who was the offical Dons Statistician?

Ken Browning.