Just seen these prices on the Sapphire website - seems a bit expensive to me:
Darlington to Durham city centre £5.20 single
Newton Aycliffe to Darlington £4.10 single
Ferryhill to Durham city centre £4.10 single
Coatham Mundeville to Darlington £2.70 single
Croxton to Durham city centre £2.70 single
RE: Arriva North East - Latest