"Poll books list the men who voted in parliamentary elections and the candidates for whom they voted. This was public knowledge because men voted in public unitl the secret ballot was introduced in 1872. Electoral records were introduced in 1832 and list all those people who were entitled to vote in parliamentary elections. Burgess or freemens' rolls listed freemen of a city or borough....

England has been divided into parliamentary constituencies since medieval times .. until 1832 each English county (except Yorkshire) was a constituency and returned two members of Parliament... Most English boroughs had two MPs ...

Until the late 19th century, the qualification for voting in parliamentary elections was generally linked to ownership of land and only a minority of men had the right to vote. From 1429 the qualification in the counties was ownership, by men aged 21 or over, of freehold land with an annual value (ie leased value) of forty shillings or more. In cities and boroughs the right to vote depended on local custom. In some boroughs, all householders (known as potwallopers) had the right to vote but, in others, only a few people, perhaps freemen, had the franchise." Herber, Mark D, Ancestral Trails, Sutton (1998)

No STERRY or variant located in the following:

• List of Freemen of the City [Livery] Companies, Resident in London & Westminster, 1538 [Ancestry]
• Westminster Poll Book, London 1774 [Googlebooks]
• City of Westminster Poll Book, London, 1837 [Googlebooks]
• Poll for Middlesex 1802 [Internet Archive]

STERRYs and variants located in:

• Essex Poll Books and Electoral Rolls
• Gloucestershire Poll Books & Electoral Rolls
• Norfolk Poll Books & Electoral Rolls
• Suffolk Poll Books & Electoral Rolls
• Wiltshire Poll Books & Electoral Rolls
• UK Electoral Registers 1920