This isn’t the appropriate forum but I just looked back at your history to get some idea as to your goals ... you’ve received loads of good advice about the inadvisability of placing discus in your current aquarium, no one is trying to be rude or mean, just offering some pretty sound advice
If you do go ahead with this plan, I hope you source some locally bred discus (at least then they are well accustomed to local tap and won’t have the stress of traveling from breeder to sale farm to UK wholesaler to UK shop to your home aquarium) as this will provide you with the best chance for success
In a planted tank, I’d suggest you feed Australian Black Worms (available as feeeze dried, pellet, flakes) rather than beef heart (you can also feed a mix of frozen blood worms, brine shrimp, spirulina brine shrimp, flakes, pellets etc, juvenile discus will just grow more slowly, and if you feed too lightly, discus seem more prone than most fish to “stunting” and will never recover to develop proper proportions)
If you do obtain a breeding pair, they may slide easily into your current set up (I’ve no idea what fish, livestock you may already have) or they may be the subject of discord
If you’re unable to provide a suitable quarantine/hospital tank, I very much recommend only bringing in a pair (or juveniles) from a local breeder (and choosing a basic sturdy bloodline)
I’m hoping you get lucky and everything goes swimmingly