[pen] er, actually - now I look at it, it's not Blue Peter (Barnacle Bill), is it?
Dabba dum-dum-dumma
Dumma-dum-dum-dum
Dumma-dummadumma- dumma-dumma dumma-dummma-dum....
It's the good old Sailor's Hornpipe. Hmm. More difficult than it looks, this game.
Meanwhile, another classic sitcom:

 

Yup,that's whole opening theme. Promise.

Porridge

Just a suggestion, if I may: we should number the entries as we suggest them: Penelope's "Blue Peter/Sailor's Hormpipe" theme was, I think, entry number 10, Watty's somewhat cryptic entry is Number 11, so whoever posts a new "tune" (which might be me in a mo) should number it as 12. We're all so good at numbering our postings (cf: "Just a Cheddar Gorge") so this should present no problems. Also, it will facilitate the occasional roundup of resolved and as-yet-unresolved tunes. By my estimation, as yet unresolved are:

3. Herr Bratsche's "Dit dit dit daa daa daa daa daa daa"; and
9. ZK's tantalising "Deee doo-doo-doop, deee doo-doo-doop".

Here's mine:
12.

Pa-pa-pa paah, paaah pa-pa-paaah
pa pah-pah-pah-pah pah-pah-pah-pah pah-pada-paah
Pa-pa-pa paaah, paaah pa-pa-paaah
pa-pa-pa-pada-pa-pa-pa pah-pada paah
Pa-pa-pa paaah, pa-pa-pa paaah da da Waaaaah-waaaah.

Cartoon, entire theme.

[Kim] Hokey Cokey - Number 9. is "Dangermouse" (I think...)

Certainly sounds like it could be. (400k wav file)