Jet A1 has various additives like antifungals and FSII (Fuel System Icing Inhibitor), so I'd be a bit surprised if all kero sold here was Jet A1. But then I'm often surprised.

I've used Jet A1 (near enough to the same as JP8/F34) quite a lot in model diesels, with good results. We also recently got hold of some F44 (JP5/AVCAT), which is what the Navy uses. The flashpoint is higher, at 60C vs 38C. I found starting much harder (unsurprisingly) but once running, it seemed no different to AVTUR.