(08 Apr 2022, 10:30 am)Ds1197 wrote Yes its every 15 minutes across the route but the X20 and 55 between Sunderland Houghton are meant to work with the 20 so they is a bus every 7/8 minutes on that section of the route

Except they essentially all follow each other. Add in the 35 and it's like a giant multi coloured conga!