Original sentence: In protest at the poll, the IRA planted four car bombs in London on 8 March 1973.Of those who did, 98% were in favour of staying in the UK.Only 58% of the electorate voted.The Nationalist community in Northern Ireland boycotted it
Edited sentence: In protest at the referendum, the IRA planted four car bombs in London on 8 March 1973.The Nationalist community in Northern Ireland boycotted the referendum on the basis of rigging with only 57 per cent of the electorate voting