Your first link explains that when you’re a UK farmer and you save seeds, you must pay the government some kind of tax for the privilege. Oh, and also you cannot give or sell other people the seeds you saved.

Your second link is some kind of NGO the whole agenda of which is to promote seed savings. Hardly an objective source to learn the attitudes to seed saving of Kenyan farmers.

The point is that enough UK farmers do save seeds, that the UK government feels it important to charge them royalty fees. So apparently the seeds work.

The seeds work. They just don't work as well. Sometimes you can sell heritage crops for more and it works out. Not all crops of hybrid variants so there is it makes sense to save seeds.

I have no idea what the UK is trying to accomplish with that paperwork, so I can't comment on it.