Thank you very much. I've done that and some others I could reasonably fill in. I've not changed suspicious other roads currently tagged 30 mph. Notes added there.
Others I added are the west end of Stockeld Road, Bridge Lane near the A65, Alexandra Crescent and Lister Street, Middleton Road, Cunliffe Road, Hawksworth Street, West Street, Lower Wellington Road, Castle Road, Weston Road, Wharfe View Road, Nile Road, Victory Road, Nelson Road, Wellington Road, Golden Butts Road.
Is Westville Road, Kingsway Drive, Victoria Road, Victoria Drive, Victoria Avenue, Easby Close, Brook Street south end 20 mph? (currently tagged 30 mph). 
Is Kings Road 20 mph all the way to Beverley Rise? And Beverley Rise and Grove Road, etc?
Is East Parade North Parade, Dean Street etc. 20 mph their full length (to junction with A65).