That should be:

Dee dee dee, di-dee, di-dee dee,
Dee dee dee, di-dee dee deeee,
Dee dee dee, di-dee, di-dee dee dee dee,
Dee dee dee, di-dee dee deeee.

[Bob] That's Z Cars yes?
[Raak] I need to have a little dee-di-dee to myself before I can hazard a guess at yours. Am intrigued to know why only gil might know that [meaning I'm really fishing for a clue]
New game? Name That Tune? Can we kill Mrs Trellis?

erm ... Is that Z Cars aswell?

Z cars indeed for me and I think for Raak too. New game on the wayhey!