I am certain that this aired on CITV, and it was an animated cartoon children's TV show which probably aired in between the years 2006-09, possibly later. I can remember that it was a trio of kids, three boys I think, (although sometimes there was a girl with them too) who could time travel somehow. I can vaguely remember details such as them accidentally changing time so Napoleon invaded England and everyone ended up speaking French, which they then went back and fixed.
As far as I can remember, the animation style was quite simplistic, but I think it was computer animated in the style of hand-drawn animation.