The outcome in Thursday's referendum on Britain's membership in the European Union is too close to call, opinion polls and media suggested on the eve of the poll, as British politicians made their final appeals to voters.
An average of eight polls since June 15 gives the Remain vote 45 per cent and Leave 44 per cent, with 10 per cent undecided. However an online survey of more than 5,000 people published Tuesday suggested that as many as one-third of voters had not made a final decision.
A Survation-IG poll published Wednesday also had Remain on 45 per cent, Leave on 44 per cent, and 11 per cent undecided.
"The key point is that plenty of voters remain undecided, which suggests that there is still all to play for in the question of the UK's future direction," said Matt Brief of IG Group, an online trader in shares, commodities and forex.
Hundreds of business executives backed the Remain campaign in a letter to The Times daily on Wednesday, saying British business "benefits massively" from the EU.
"We own and run more than 1,200 businesses, from micro companies to the FTSE 100, employing more than 1.75 million people," the executives said.
"We know our firms are stronger in Europe. Our reasons are straightforward: businesses and their employees benefit massively from being able to trade inside the world's largest single market without barriers."