LONDON police have admitted they were heavy-handed in the treatment of protesters during President Jiang Zemin's visit to London last October but claim a report published on Friday showed their action was necessary to ensure the Chinese leader's dignity. 'This is a very politically sensitive visit. Both the Chinese and the British Governments have expressed concern with regard to demonstrators who may wish to disrupt the visit,' the briefing note given to officers before Mr Jiang arrived in Britain said. A memo signed by Chief Superintendent Robert Mackie, the police security co-ordinator for the visit, explained that Chinese officials had been anxious to ensure the President was not exposed to any protests. The report highlighted police concerns when a Tibetan activist threw an egg that hit an officer. 'The officers could not be expected to assume that eggshells thrown in the future would merely contain yolks,' the report said. Assistant Commissioner Ian Johnston said that, on reflection, some decisions made by officers to stop protests during the visit were heavy-handed. 'We do recognise the major public concern about the policing of this event and some beat officers made decisions which in hindsight were perhaps taken too soon,' he said. Police arrested 19 people during the five-day state visit.