(27 Jul 2017, 7:25 am)Andreos1 wrote Although far from scientific, my anecdotal evidence suggests this board is the one that tends to have a spare on.

Seen it umpteen times over the last few months and it very rarely has an Omnilink offering.

I've always thought the usual board allocated the spare bus is the third/last to leave the depot. On every occasion that I have used the 07:47am X24 from Sunderland (or 08:50am return from Newcastle), it has been a gas bus.

Of course, it's not uncommon for two Omnilinks to be missing at once.