This dataset was created to demonstrate the record linkage possibilities for the software kleio. The dataset contains a machine-readable transcription of the 1806, 1807 and 1812 poll books for Colchester. It contains four tables: the first three tables contain the voting choices of each elector along with their name, address and occupation. The fourth table contains a standardised version of the occupation and the occupational code HISCO. (See M.H.D. van Leeuwen, I. Maas and A. Miles, (2002) HISCO - Historical International Standard Classification of Occupations, Leuven.)