I've just seen an Utterly Butterly advert, and the music in the background was from an early 70's film called 'Love Story' with Ryan O'Neal and ? Mia Farrow. I think the tune was called 'Love Story' and there was a vocal version, but I can't recall who sang it - someone like Andy Williams I think! Hope that helps!
Thank you flity41 for your answer concerning the Utterly Butterly advert 2002 I have used your hints to track down the song via the net and I have found :
Vocal Song is by "Andy Williams - Where Do I begin" which is the theme from Love Story.
There are a number of instrumental versions out there as well :
Richard Clayderman - Theme From Love Story
Thanks once again.
p.s: you can download the song via Morpheus / Limewire ;)