I use the 828 often for work it's a mixed bag of buses, some on time, some late, some missing altogether - as a user you want consistency. I've caught an ex Arriva solo (181) home a couple of times this week on the 1820 from Stafford and it's been fine as not very busy. Mix of new old and very old bigger vehicles generally - as long ad their fit they don't need to be brand new. It does seem odd to see brand new buses on the 826 and 827 though if the longer distance 828 is struggling.