The concept of advertising labels was taken a step further with the Year of the Reciprocating Llama Two Pence stamp. These came in sheets of nine stamps (including one sport) alternating with nine labels. I will mot list the businesses involved as your are probably knowledgeable about them anyway and if you click on the sheet you can see it enlarged.

If you have not spotted the sport, it has the Patrician and Morporkia emblems reversed. While the design makes clear that this is Merchant Guild Stamp, I find this stamp just too over ornate and flowery. I would have preferred references to their trading activities, but you do get lashings of that from the advertising labels.