Sleaford and North Hykeham is a parliamentary constituency in Lincolnshire, England which elects a single Member of Parliament (MP) to the House of Commons of the UK Parliament. It has been represented since 2016 by Dr Caroline Johnson, who is a member of the Conservative Party. The seat was created in 1997 and has always been represented by Members of Parliament (MPs) from the Conservative Party; like all British constituencies, it elects one candidate by the first-past-the-post voting system. Johnson became the MP for the constituency after a by-election in December 2016, following the resignation of the previous MP for the seat, Stephen Phillips. The constituency is considered a safe seat for the Conservatives. Boundaries 1997–2010: The District of North Kesteven except for the ward of Bracebridge Heath, and the District of South Kesteven wards of Ermine, Heath, Loveden, Saxonwell, and Witham Valley. 2010–present: The District of North Kesteven wards of Ashby de la Launde, Bassingham, Billinghay, Branston and Mere, Brant Broughton, Cliff Villages, Cranwell and Byard's Leap, Eagle and North Scarle, Heckington Rural, Heighington and Washingborough, Kyme, Leasingham and Roxholm, Martin, Metheringham, North Hykeham Forum, North Hykeham Memorial, North Hykeham Mill, North Hykeham Moor, North Hykeham Witham, Osbournby, Ruskington, Sleaford Castle, Sleaford Holdingham, Sleaford Mareham, Sleaford Navigation, Sleaford Quarrington, Sleaford Westholme, and Waddington West, and the District of South Kesteven wards of Barrowby, Ermine, Heath, Loveden, Peascliffe, Saxonwell, and Witham Valley. The constituency covers the towns of Sleaford and North Hykeham and a large area of rural Lincolnshire south west of Lindsey. The constituency's boundaries roughly correspond to those of North Kesteven local government district. In their formative proposals for 1997, the Boundary Commission for England proposed calling the new constituency Mid Lincolnshire, however the name was changed to its current form during the local inquiry process. The inclusion of North Hykeham in the constituency title was criticised by the author and psephologist Robert Waller in 1995, on the grounds that North Hykeham was effectively an overspill area of the City of Lincoln; however, not on the grounds of its actual inclusion, as its local government authority has long been seen as linked with the villages to the south in this seat, and wholly separate from the city. Following another Boundary Commission review, the constituency boundaries with two of its neighbouring seats Lincoln and Grantham and Stamford were changed for the 2010 general election. The areas within the constituency