THREE Britons and a New Zealander have been arrested in the past two days and small amounts of heroin, cannabis and LSD seized as part of a police crackdown on expatriate drug abuse linked to Lan Kwai Fong socialites. In a series of operations which started on Friday, Narcotics Bureau officers raided a number of apartments including a flat near Aberdeen and arrested three men, aged between 19 and 30. Police found 30 grams of heroin, 70 g of cannabis resin and two tabs of LSD in the Ap Lei Chau flat where a New Zealander and two British men lived. The two British men were released on bail yesterday while the New Zealander was charged with one count of trafficking, two counts of possession and one count of possession of an instrument fit for smoking. He is due to appear in court tomorrow. The fourth man, a 25-year-old Briton, was picked up yesterday afternoon in a raid on a Lantau home but was later released on bail. Detective Senior Inspector David Ley said officers found what was suspected to be 250 g of cannabis resin in the Pui O flat, and this has been sent to the Government chemist for analysis. Inspector Ley said police had been investigating drug abuse by expatriates for more than a year.