Power Of The Primes Primemasters Wave 2 found in the UK! User @Scott_XIII provides the hint that lets @returner collect the evidence: Wave 2 consists of Alpha Trion with Landmine Alchemist with Submarauder along with repacks of Liege Maximo with Skullgrin Vector Prime with Metalhawk ASDA is the only one of the UK toy stocking supermarkets to have had POTP so far, and they've had both assortments of Primemasters but no other sizes of toy!
Are you local? I'm collecting Derby locals for a facebook group, the plan is to get a meet going eventually.