Nacton was the Union House for Colneis & Carlford Hundred - you will find lots of information together with present day photographs etc at Peter's excellent web site
http://users.ox.ac.uk/~peter/workhouse/Any records available today would be placed with the SRO in Ipswich.
The web site states following available ~
Suffolk Record Office has limited holdings including: Guardians' minute books (1835-1930); Ledgers (1835-1930)); etc.
Pat ...