I used to feed those quite a few years ago, but switched to Burgess pellets because I had heard much better things about it. The P@H pellets always varied batch to batch and they ended up some weird colours. Not to mention they smelled pretty bad. My piggies only tolerated them, unlike now, where they wheek their heads off for the Burgess. I never have any inconsistencies (apart from when they changed the nugget shape) and they look and smell a lot better to me.
I also now try and avoid buying from pet shops that don't sell live pets within their chain (not because they've understandably had their licence revoked), which includes Pets At Home, ruling out their nuggets for me.
The other concerning thing is they are oat and wheat based, rather than hay or grass based. From what I've heard, wheat should be avoided with guinea pigs. I don't know if that is true, but I think you would be better sticking with your normal pellets.
tempted to give a ring and ask about the packaging.
