Charts are ranked by number of gross audience impressions, computed by cross-referencing exact times of radio airplay with Arbitron listener data."

Thus, the TRP is a measure of the purchased points representing an estimate of the component of the target audience within the gross audience.

For example, if an advertisement appears more than once, reaching the entire gross audience also, the TRP figure is the sum of each individual GRP, multiplied by the estimated target audience in the gross audience.

The tour eventually came to an end by closing the Silver Clef Award Winners Concert, at Knebworth Park in September 1990, after 200 performances, a gross audience of 4.25 million fans, and box-office receipts of more than £60M (not including merchandising).