Hey! Reasonably good chance I will be moving up from London to Leeds around April next year My family are all up that way so have climbed a lot at Harrogate and also checked out City Bloc in Leeds (prefer bouldering generally).
I will defend use of knees all day long. Two of my hardest outdoor ascents have involved using my knee on a foothold (one of them a sharp crimp that left a dent in my skin for hours afterwards!). This one is at Almscliff so near you. Probably the easiest section of the climb but I was so nervous about dropping the top having finally done the hard bit that I was going to take every advantage available!