As the UK government prepares to begin formal negotiations to leave the European Union and the SNP prepares for its forthcoming spring conference, our new poll for STV News shows voters split down the middle in their constitutional preference. Among those who expressed a voting preference and who would be very likely or certain to vote in an immediate referendum, 50% (+2pts) said they would support independence with the other 50% of voters (-2pts) saying they would back Scotland remaining in the UK.