SOME of the most enterprising ventures in British film production have been carried out by British Instructional Films, whose managing director, Mr. Bruce Woolfe , will talk tonight. Amongst the pictures that have gone out under their name are Mr. Anthony Asquith 's briltiant films Shooting Stars and Underground, which were made in their studios at Welwyn. Another remarkable film that was recently shown in London-Shiraz, with its Indian setting and all-Indian cast-was also sponsored by them.