On 12 October 1984 - at the Grand Hotel in Brighton - the IRA tried to blow up Prime Minister Margaret Thatcher and her Cabinet during the Conservative Party conference. Five people died and 34 were injured.
The author of the House of Cards political thrillers and former Conservative advisor Michael Dobbs was there.
In a programme for BBC Radio 4, he argues that the bomb has radically changed British politics, hiding politicians behind security barriers. Here - with the help of archive recordings from the time - he returns to Brighton.
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