sales figures for UK soul singles?

Been wondering what the sales figures were like for soul singles in the 60's and 70's.

Cant seem to find ant data on the internet apart from certified gold and silver discs.

At the time there was a lot of talk that some soul sides that sold well did not sell in chart shops and thus did not apear in the official charts.

Also some records only sold in the north. All v ery well but what were the actual figures compared to some acts which made the charts?

Are these sales figures company secrets guarded by the auditors in case the taxman or the artists find out how much was really made?

It is quite often reported that Jimmy James A man like me sold in excess of 50k units, presumably on the back of plays at the Torch.

Any info guys or sites that we can garner this data. Just out of curiosity.

Dave Banks