It’s 40 years since the IRA kidnapping of Don Tidey and the dramatic conclusion of the siege at Derrada Wood in Ballinamore in Co Leitrim, which resulted in the shooting dead of a Garda recruit and an Army Private. Leitrim journalists, Ronan McGreevy and Tommy Conlon have published a new book on the incident – Ronan says the silence then, and since, around Ballinamore, was something which needed examination