hello bikestuart,
welcome to the forum. this frameset is the Rekord model and looks to date from the early to mid 1970's.
the frame is constructed with Agrati "Roma" pattern lugs and bottom bracket shell. the fork tips and dropouts are likely Agrati "Racer" pattern; they have no markings.
this model enjoyed quite a long production life and there are changes from year to year. you can see some of the iterations by checking google images for "Bianchi Rekord."
the forum had a recent thread on one of these you may wish to explore -
http://www.bikeforums.net/classic-vi...s-bianchi.html