I obviously can't remember this far back, but my mum told me that before I started talking, I used to 'sing' along to the theme tune of Neighbours, and sitting me in front of the TV whenever it came on was one of the few things that kept me quiet. This is it (it would have been version 1 or 2): https://youtu.be/1zXF2v4ZgaU

The first ones I can actually remember are probably Playdays ( https://youtu.be/uIUI2GuX5xk?t=55s ), Postman Pat ( https://youtu.be/ZoWvX7lRLEc?t=1m3s ), Fireman Sam ( https://youtu.be/tDtlJU8e8v8 ) and Thomas the Tank Engine ( https://youtu.be/eswjwcJ3Pls ).

I maintain to this day that Pat, Sam and Thomas had quality theme tunes. The giggle at 2:03 of Postman Pat reminds me of Ian Anderson of Jethro Tull ( https://youtu.be/IxiS6K8jBi0?t=14s ), ( https://youtu.be/zEYJrBoxvOE?t=1m5s ).