What's the advert

Growing up in the 80s and 90s I had some brilliant advert music to look forward to but there's one song that still swims around my head today and I cannot find anything about it anywhere. I believe the tune goes:

"His name was Archibald Fitch, he's not very rich, his face is badly designed, He's clumsy, he's beautiful and he's mine"

That may be wrong but if you recognise it you'll know the one I mean.

Can anyone help me end decades of torture and give me a correct answer!.

It's seemingly not a Hovis Ad which the Internet will tell you it is.