Polls have closed in the Newark parliamentary by-election triggered by disgraced ex-Tory Patrick Mercer's decision to stand down.
The Conservatives are on course to hold off the threat from Ukip but only with a massively-reduced majority, according to polling.
Mr Mercer, who quit over what a sleaze watchdog said was the worst breach of transparency rules it had dealt with, won by 16,152 votes from Labour in 2010.
Ukip has put up MEP Roger Helmer - re-elected to the European Parliament in the party's "earthquake" victory last month - to take on Conservative Robert Jenrick in the constituency.
More top news
A towing vehicle has hit a passenger plane at Glasgow Airport after sliding on ice. The British Airways plane was preparing for take-off.
Vaginal mesh implants are designed to help deal with incontinence and other problems following childbirth.
Ice warning in force across northern and western areas.