Tahqiq = scholarly invetigation into a Shari' Matter, hence Tahqeeqat is its plural. I thought the Mufti was from Bangladesh. I have been to that masjid which is run by Gujarati brothers. I know a brother who studied under him. Is there not a packaging company by the masjid? Check your email. Anyway, i would recommend Mawlana Zaheer Mahmud as an English speaking scholar- he is a personal friend of mine who is active in Aston (Jame Masjid, aka: Saddam masjid), now living in Handsworth Wood area. Wassalam