Quack quack oops
There was an era, now long gone, where sound effects and character voices appeared as part of the radio presenter armoury.
BBC local radio was littered with talking or squeaking animals; Ed Stewart had 'Myrtle'; and Tony Blackburn had his dog 'Arnold'. DLT had his, well, 'Quack, Quack. Oops'.
The ‘Oops’ came from the PAMS Series 32 jingle package; and there was a great Sonovox ‘Yeeeeeeeaaaaahhhh’ in that set too. Check http://davidlloyd-radio.blogspot.co.uk/2012/06/sound-of-sonovox.html for more great Sonovox.
Sadly, I can shed little light on the ‘Quack, Quack’