Okay so there is obviously something in the air about rodent escapes. I was just sat at my PC and saw a white shape run across the floor. In the normal course of events I would have assumed it was a mouse but as Lara was running around thought it highly unlikely as she would have pounced. I then happened to glimpse over at the gerbil rotastak and notice that the u-bend tube that links two of the levels together was not there!
I then notice that the white mouse I saw running around was Titch the Gerbil who had decided to go a wandering. I then moved pretty quickly and grabbed him (or should I say he decided to run up my arm into my sleeve). After putting him in his rollaround ball while I reaffixed the link I got him back into his cage. Here is a picture of the little rascal about to munch on a dried cranberry: