I was only a lad (so we're talking 30 odd years ago, give or take). If I remember rightly, it was a Challenge Cup tie and Hull played Fulham. I'd imagined that it was at Fulham.
It would have possibly been before the Sterlo era, but Topliss might have been playing for us then. Knocker Norton era, iirc (but I'm happy to be corrected. All I really remember was that we were in a higher division than you at the time, and I was really excited to have a trip to London. I *think* we first started to follow FC as a family in 77-78 or 78-79, so it would have been later than that, but not by too much).
My memory isn't my strongest point, as you can see.