The only thing DD liked at that age is The Night Garden. Its the only thing she watches now too!
Sorry, we don't have sky or digital or cable so we don't know about other kids programmes!
My personal opinion is that its okay if you sit and watch with them and interact, talk about it etc etc. I just try to avoid using it as a babysitter (which is oh so tempting and does happen occassionally in this house!)
Sarah x