The first release in 1970, WIP-6075, had the "block" label design, but the very next one, "John The Baptist" by John & Beverley Martyn, featured a third pink label design, characterised by a large white letter "i" on the left-hand side. This design was used for the remaining pink label issues, interrupted with increasing frequency by green Chrysalis label releases, as denoted in the listing below. Bronze label singles by artists such as Tony Hazzard and Uriah Heep began to appear in the Island listing from May 1971, for a couple of years until that label's own BRO- series was begun. An American record label, Blue Thumb, also released a small number of UK singles with WIP-series numbers in 1972/3. The one-off catalogue number WI-4002 was given to the flexi-single "Let There Be Drums" which came with the album "Rock On" by The Bunch in 1972.