It began on 8 March 1973 when an 11-person ASU , ( which included now well known Irish republicans including the Price Sisters and Gerry Kelly ) bombed the Old Bailey courthouse . Despite warnings , one person died of a heart attack and about 200 were injured , some seriously . The IRA always believed that one bomb in England was worth about 30 in Belfast and the huge media response seemed to prove this theory
bombed the Old Bailey courthouse
1973 Old Bailey bombing
Provisional IRA's Balcombe Street Gang