20-02-1984 Firemen check for injured guests at the heavily damaged Grand Hotel, Brighton, in the aftermath of the bomb attack in which the IRA attempted to assassinate Prime Minister Margaret Thatcher © Martin Mayer

12-10-1984 Bomb damage is clearly visible as firemen check for injured guests at the Grand Hotel, Brighton, in the aftermath of the bomb attack in which the IRA attampted to assassinate Prime Minister Matgaret T... © Martin Mayer

12-10-1984 Firemen still checking for damage at the Grand Hotel, Brighton, the morning after the bomb attack in which the IRA attempted to assassinate Prime Minister Margaret Thatcher © Martin Mayer

12-10-1984 Firemen still checking for damage at the Grand Hotel, Brighton, in the aftermath of the bomb attack in which the IRA attempted to assassinate Prime Minister Margaret Thatcher © Martin Mayer

12-10-1984 Firemen check for injured guests at the badly damaged Grand Hotel, Brighton, in the aftermath of the bomb attack in which the IRA attempted to assassinate Prime Minister Margaret Thatcher © Martin Mayer

12-10-1984 Firemen check for injured guests at the Grand Hotel, Brighton, in the aftermath of the bomb attack in which the IRA attempted to assassinate Prime Minister Margaret Thatcher © Martin Mayer

12-10-1984 Firemen rescue an injured guest at the Grand Hotel, Brighton, in the aftermath of the bomb attack in which the IRA attampted to assassinate Prime Minister Matgaret Thatcher © Martin Mayer

12-10-1984 Firemen rescue an injured guest at the Grand Hotel, Brighton, in the aftermath of the bomb attack in which the IRA attempted to assassinate Prime Minister Margaret Thatcher. The Onserver headline says... © Martin Mayer

12-10-1984 Police and firemen outside the heavily damaged Grand Hotel, Brighton, just after the bomb attack in which the IRA attempted to assassinate Prime Minister Margaret Thatcher © Martin Mayer

12-10-1984 Firemen check for injured guests at the heavily damaged Grand Hotel, Brighton, in the aftermath of the bomb attack in which the IRA attempted to assassinate Prime Minister Margaret Thatcher © Martin Mayer

12-10-1984 Police help a guest caught in the bomb blast at the Grand Hotel, Brighton, which the IRA detonated with the aim of assassinating Prime Ministe Margaret Thatcher © Martin Mayer

12-10-1984 IRA Bombing of The Grand Hotel, Brighton. Hotel staff helping a guest and a journalist interviewing shocked and bloodied delegates to the Conservative Party conference gather outside The Grand Hotel,... © Martin Mayer

12-10-1984 IRA Bombing of The Grand Hotel, Brighton. Hotel staff helping a guest and a journalist interviewing shocked and bloodied delegates to the Conservative Party conference gather outside The Grand Hotel,... © Martin Mayer

12-10-1984 Shocked and bloodied delegated to the Conservative Party conference are helped away from The Grand Hotel, Brighton, after the IRA exploded a bomb in an attempt to assassinate Margaret Thatcher. © Martin Mayer

12-10-1984 Shocked and bloodied delegated to the Conservative Party conference are helped away from The Grand Hotel, Brighton, after the IRA exploded a bomb in an attempt to assassinate Margaret Thatcher. © Martin Mayer

12-10-1984 Shocked and bloodied delegates to the Conservative Party conference outside The Grand Hotel, Brighton, after the IRA exploded a bomb in an attempt to assassinate Margaret Thatcher. © Martin Mayer

12-10-1984 Serious structural damage visible on the Grand Hotel, Brighton, just after the IRA exploded a bomb in an attempt to assassinate Margaret Thatcher. © Martin Mayer

12-10-1984 Grim faced Margaret Thatcher (R), William Whitelaw (L) and Selwyn Gummer at 1984 Conservative Party Conference on the day after the IRA bomb attack on Thatcher, Brighton © Martin Mayer

12-10-1984 Margaret Thatcher speaking Conservative Party Conference, Brighton on the day of the bombing of the Grand Hotel by the Provisional IRA. © Philip Wolmuth

12-10-1984 Conservative Party Conference, Brighton, on the day of the bombing of the Grand Hotel by the Provisional IRA. © Philip Wolmuth