Carp are an imported species. No carp 'originated' in the UK
As for genetic altering. There are now carp which are bred to be resistant to KHV which can only be a good thing.
A fish is a fish as far as I'm concerned. So long as it's healthy, good looking and puts up a good fight; I'm happy
I use amnesia 15lb for all my pop up rigs, hinged stiff links. i took my first "hard" water using fluro hooklinks in late 90s. again using amnesia 15lb in clear and bottom baits. i think i had the advantage as everyone else was using supple braided hooklinks. so it was a different presentation. so id use it when no one else is.
Sure everyone on here will agree it's up to you where you want to fish chap. As far as British 50lb commons go there is definitely one in Burghfield and there will be others elsewhere,maybe a topic for a new thread. Hope you enjoy your session mate