I spent a while in Cardiff today, and noticed an anomally I've not seen before.
WTT showed 231002, 231006 and 231008 all out working - and they were - but not the services shown in WTT! 002 was working the services allocated to 006, 006 those to 008, and 008 those to 002 - for most of the day. Perhaps it's a case of the units being swapped between being allocated and entering service for the day, but by late afternoon, they were still showing incorrectly - reflecting the source data, no doubt. Surely by then source systems should have been updated / corrected? Or perhaps they were, but WTT doesn't receive intra-day updates from the relevent source systems?
I'm hoping that this is a very rare occurrence - otherwise it makes me a little nervous about accepting allocation data from WTT - may have to fall back to clear sight identification.