Having peaked earlier today at 86 per cent, Betfair now predicts a Remain vote to prevail with just 68 per cent.
In Newcastle, which was expected to be strongly Remain, the result was almost evenly split, whilst Leave won by more than 60 per cent in Sunderland.
In Swindon, meanwhile, voters backed Leave, but in line with expectations.
While Gibraltar voted to Remain by a landslide, it does not have as many votes.
However, overall the country is still finely divided and most commentators agree it is too early to call.
A YouGov poll released earlier this evening predicted that Remain will win the EU referendum with 52 per cent of the vote.
The findings were backed up by a subsequent Ipsos Mori poll which put Remain on 54 per cent, while Leave had 46 per cent.