Mr Sloan said that in later years as the scene changed and the band continued with a turnover of members mainly from the rich musical scene in Central Hawke's Bay the ban tried a change of name to Ex S.D., but fans would not adopt the change, and wherever the band went it was still referred to as Sir Duke.
There were many highlights, but one of the biggest came just two years ago when Sir Duke was a support act for the The Mission's British and Irish Invasion concert in 2014.
The other originals expected for Sunday's reunion, which starts at 2pm, are lead vocalist and guitarist Pik Atkinson, who is still with the band, Neil Rogers, who is making the trip from Australia, Max Sherlock, and Barry Robertshaw.
With Messrs Sloan and Atkinson the current lineup is completed by Pat Mahoney, Cougan Renata and Janeene Toner.