(12 Dec 2013, 8:00 pm)Tom wrote 6 and 42 interwork, so not rare really.
I didn't know that don't pay much attention to Arriva and there interworkings etc,plus it's rare I ever go to Durham anyway, and I agree with Daniel that having branding on an Interworking Service, Would it not be worth Re-Numbering the 42 as 6A so that the Branding isn't meaningless.