One property to have been submerged was, I believe, Alton Hall Farm. There was also a mill, certainly a building of some interest, which was removed and taken to the East Anglian Rural Life Museum at Stowmarket (their website may give further information).
My former neighbour worked in the admin office and her husband helped construct said reservoir, I'll ask them what properties disappeared. I shal be seeing them in the next few days.
There was a chap in Stutton who collated all he could about the area, unfortunately he is now in residential care and shall also ask my former neighbours how lucid he is and where all his material went (I hope the Suffolk Records Office).
I hope this helps.
Regards... Andrew.