U mean the perm DDs? Hope that it is not the B9TLs affected, or
else it will affect the WAB status on weekends. And for the past 2
weekends have always noticed service 163's MK4 permers running on
service 80, which left service 163 with almost full K230UB fleet on
weekends 
.
62, 80, 87, 89 use mainly single deck buses on weekends due to
lesser crowds I think. Most of the spare volvos as well as some
taken from 100, 105, 119, 156, 163 etc. 62 uses mainly KUBs from
either spare or taken mainly from 27.
