Uk p2s stock confusion

I was going to order the p2s combo but found it out of stock on the uk store. Fine no issues there , i can wait but then i noticed the standalone p2s was in stock and then also the ams2 standalone was in stock.

Is there an actual difference in the combo ? Bar 30 quid cheaper? I had just assumed they would just grab a p2s and an ams2 off the shelf and stick it in a massive box and post that .