Thanks again for those links. I've had a quick look and have signed up on one and plan to look at them more closely once our Thanksgiving (this weekend) is over and the family's all gone home again - well stuffed!! (Turkey and family!)
My George Mannall is at Mill Hill, Woodbridge, in the 1841 Census, then in Debach (occupation Miller) for the 1861 Census. I believe they were based in Debach for quite a while as GGrandmother was married from there in 1868. 'My' George's father is in Brandeston as an Ag Lab on the 1841 Census. I believe George had a brother John, born 1819 in Sudbourn but whether he is the Miller you refer to I don't know for sure. Another brother, James was born in 1825 and William in 1826... all in Sudbourne. Unfortunately they weren't too imaginative and repeatedly christened boys George, James and John so they're a bit hard to sort out.
I don't have anything relating to the names Keen or Markin but will keep you posted if I find a link. Thanks again for all your information.