I'm not a regular user of the X10, but did travel on it again the other day to Newcastle and back and these always seem really busy.
Is it just me that thinks it would be sensible to go back to the days of the X9 and X10 every 30 minutes, with the X9 going to Billingham and Peterlee and the X10 to Stockton and Dalton Park?
I think the usage warrants it, and would give a quicker end to end journey time too.