I really don't understand why people get so exercised about the EU before informing themselves about what is really happening. It is to do with seed varieties having to be registered in order to be sold, a process which costs a lot of money. Seed companies only register varieties that sell well, those that don't are dropped from catalogues and may disappear. The EU's argument is that registration ensures the quality of seeds being sold.
It is not going to interfere with gardeners swapping seeds. It will make it harder to get unusual varieties of seeds but Garden Organic already has a way round that problem for saving old vegetable varietties. Others will, i'm sure, find ways round the new rules.
It should not be forgotten that there is a British officialdom menatlity that means rules are applied in the UK to excess as the Jobsworths over interpret regulations. EU rules are there to try and bring equality of standards and competition across many countries of diverse incomes, productivity, character and customs. There is, for example, no Health and Safety department at my local council here in Belgium. People are expected to use common sense.