 In 1891 , after Karim 's return to Britain , he asked Reid to send his father a large quantity of medicinal compounds , which included strychnine , chloral hydrate , morphine , and many other poisons . Reid calculated that the amount requested was " amply sufficient to kill 12 @,@ 000 to 15 @,@ 000 full grown men or an enormously large number of children " and consequently refused . Instead , Reid persuaded the Queen that the chemicals should be obtained at her expense by the appropriate authorities in India . In June 1892 , Waziruddin visited Britain and stayed at both Balmoral and Windsor Castles . He retired in 1893 and in the New Year Honours 1894 he was rewarded , to Victoria 's satisfaction , with the title of Khan Bahadur , which Lansdowne noted was " one which under ordinary circumstances the Doctor [ could ] not have ventured to expect " . 
