I use the X4 daily. It's not the most reliable and gets worse through the day. 6 minutes turnaround at Whitby and 5 minutes at Boro. No catch-up time. If the 8-00am is late, so will the one at 12-00noon. I try to avoid the service if a Temsa is on - i could walk up Lythe Bank quicker - almost. Love to see deckers but not an expert on bridge heights - they're at Marske, Saltburn, Brotton [whichever way you go] and Carlin How. And the roadworks in [currently] 4 locations makes thinks even worse.