If you're talking about the top 40 countdown used on TOTP I'm sure they used Yellow Pearl as a backing, as already mentioned it was a largly instrumental track and I think back then rather than countdown the top 40 in one chunk it was broken throughout the programme, ie; 40-31, 30-20, etc. In fact, I've a feeling that TOTP only included a countdown of the top 30. I used to religiously VCR TOTP weekly throughout the 80's and 90's and still have many of them boxed away somewhere.