(01 Aug 2014, 5:07 pm)Jimmi wrote You can't really extend the 21/21A much further due to driving hours, also if the 21/21A were to extended beyond Peterlee it would have to be split at Peterlee or tachos would have to be fitted.
The 57A is the fastest route from Hartlepool to Durham and takes about an hour.
To be fair you could go another 2.5 hours, though anything more than 2 hours would be asking for trouble. We used to go to Sunderland which was an additional hour (made them both a 4 hour rotation)