These overprints are now a new Machin collecting phenomena and are sort after by many specialists as they make a nice addition to the originals and add further interest to their collections.
I will add some pictures of the Boots Promotional overprints here shortly
Due to demand and a growing shortage of the Boots Labels , continuing the trend, labels without the Boots logo were also used for promotion. There are many to collect and as the popularity for them grows new designs are appearing on a regular basis.
A full list of these labels (including the Boots versions) were posted on the 26/11/06 this is due to be updated soon.