I’m not 100% sure on this but I believe that those Airfix kits are reboxed Academy kits. I have both the Academy Tiger I and Academy Hetzer kits, though I haven’t built them yet, the parts do look very crisp and well detailed. I have built some other Academy armor kits and they were alright. Better than Italeri or Heller but not as good as Tamiya or Takom. Good luck with those kits.
If you check on Scalemates.com, you can find the lineage of each kit and if they are reboxed Academy kits. If they are, most of the new Academy kits are pretty decent, but being better than or worse than Tamiya or Italeri kits is a rather broad brush, as each company has some kits that are better than the other company’s kits. Now Heller and Takom on the other hand… [;)]