I think it was. Perhaps not in the transfer of votes from the SDLP to Alliance )as both Alliance and Sinn Fein are Remain), but in the massive boost to the core Alliance first preference vote which I suspect came mostly from Remainer unionists disillusioned with the Leave stance of the Unionist parties.  N. Ireland voted 56% Remain, and I suspect that preference has increased since. There was no where else for Remainer Unionists to go.

Index of Frank's Diaries