Did Christine ever present The One Show without Adrian (or vice-versa)?
Before Adrian left for ITV - they seldom appeared with other co-presenters in recent times.
Rumour has it that they arranged to take time off at the same time so that neither of them would have to present with stand-ins. (And they also are suggested to have arranged it so that Chris Evans never got to be fill-in presenter by co-ordinating their holiday...)
This was after their early experiences presenting WITH stand-ins. I think Adrian presented with Ellie Harrison at least once, and Christine presented with Dom Littlewood and Dan Snow, as well as Andrew Neil, Nicky Campbell and Nick Knowles and possibly also Colin Jackson. Christine had more co-presenters because in 2008 Adrian was overseas for quite a bit of the Euro 2008 football and left for the Beijing Olympics a bit before The One Show came off-air.
On two occasions at least they presented the show solo when the other was stuck at an airport for some reason, and Adrian presented solo in the studio the day before Christine water skied across the Channel.
Once they co-ordinated holiday - the BBC replaced them with pairs of stand-ins (Gloria Hunniford and Gethin Jones, Myleene Klass and John Sergeant were paired together for a week each, and Nicky Campbell, Gabby Logan and Matt Baker all stood in before Adrian and Christine moved on.)