I really don't like these things at all. I can see many people getting quite confused. The placement of the value tablet high left leaves a huge space and to me it looks wrong. Oh well. I just hope the series is like Postage Dues. Buy them, stick them in the album and move on.
On 15 August you'll need to get the books, Large (horizontal) 1st and 2nd and coil stamps. there will also be self-adhesive sheets of the standard size fat 1st and fat 2nd.