after BA in psycology or sociology in India will i be eligible to do my masters/post grad diploma in Criminology in England.can i please have the names of colleges offering BA in psycology or sociology in kolkata.

In the UK you wont be able to go for a diploma course as the visa would become a problem. or else the diploma should lead to a degree to attain the visa. And yes you can get a MA in Criminology after completing BA in Sociology. To get an answer for the Institute in Kolkata, please post this question