Concert promoter Peter Aiken and his wife, cyber psychologist Mary Aiken, have issued their second set of High Court proceedings in the space of a week, this time against a north Dublin law firm. The newly filed suit against the founding partners of Maguire McErlean solicitors in Drumcondra follows the lodging of an action by the Aikens against their Howth neighbours Suzy Byrne, daughter of the late broadcaster Gay Byrne, and her husband Ronan O’Byrne last week.  The Currency understands the neighbours are in dispute over the planting of trees or a hedge row by the boundaries of their multi-million…