What is the exit poll?
The exit poll is a survey of thousands of voters immediately after they have cast their vote. This covers England, Scotland and Wales.
The poll is commissioned by BBC News, ITV News and Sky News. The results are released just as voting closes, at 22:00 GMT.
How the exit poll works?
Based on 144 constituencies, in England, Scotland and Wales, that demographically represent the country. The constituencies are surveyed from one election to the next. Exist pollsters are based at a selected polling station in a chosen constituency. Every 10th voters is given a replica ballot to fill out, they then drop it into a box which will later be opened.
Results are not said out loud.
The results are then analysed by experts in London.
How accurate is the exit poll?
The general rule of thumb is that the exit poll is considered to be accurate when it comes with in 15 seats of the final outcome.
The chief executive of pollsters Ipsos Mori, Ben Page, says: “It is very unlikely the exit poll is wrong enough to mean the Conversatives have not got a large majority.”
