Personally I enjoy,
Dick Hudsons pub down to Eldwick; It’s not very steep, it’s not very long, it just has something about it thats enjoyable.
Also the A658 from Rawdon to Apperley bridge, again, not steep but a fast fun descent on a good road with some flowing bends.
and the descent from Birkdale into Nateby (B6270) Only steepens at the end but if you sprint the top bit, you take off over the little rises.
Oh, and not forgetting the Run off Fleet Moss into Hawes!!! I’ve hit over 60 mph down there, not for the feint hearted!
In fact, enjoy a vid of the legend that is Steetons own Sid Barras chasing down a breakaway. Ok he’s riding up it, but probably as fast as most can ride down it. (3min 50secs) Look at the crowds!!