Something I was thinking of to distract me from the sheer boredom of sitting on 4811 on over an hour and a half.

I think there should be two X21's an hour with the extra one connecting to service 21A and I think you could time it so there is a bus around every 10 minutes between Peterlee and Sunderland.

The departures from Park Lane could be like this:
05 mins past - 22 to Durham.
15 mins past - X21 to Peterlee and Darlington.
25 mins past - 23 to Hartlepool.
35 mins past - 22 to Durham.
45 mins past - X21 to Peterlee and Middlesbrough.
55 mins past - 23 to Hartlepool.

I still think part of the reason the X21 hasn't been a massive success because it leaves Peterlee Bus Station for Sunderland just behind the 23 and from Park Lane it is sandwiched between the 22 and 23, part the reason the 1615 journey probably left with 2 passengers (me being one of them) was because the 22 and X7 left Park Lane late.

Another thing where have all the people in the Oakerside area in Peterlee who travelled to Sunderland gone, a few used to get on to Sunderland yet now they only have the 21/X21 once an hour they have disappeared (although I've only used the 21/X21 on a morning and an evening so I may not be getting the full picture on numbers on this part of the route).

Also they still can't seem to show the correct display on the 21 to Peterlee with most occasions I've seen it on the branded examples it has just displayed Peterlee instead of Peterlee for Sunderland and I'm not imagining the Peterlee for Sunderland display as I've seen pictures on Flickr.