The question is, where can you buy [URL=https://metropstore.co.uk]NPK fertilizer[/URL] in the United Kingdom? The answer is in the UK. You can buy this product in both compact and concentrated forms. Fertilisers that contain NPK nutrients are also referred to by different names, including All-purpose, All round, General Purpose, Compound, and Universal. You can find all-round fertilisers as well as specific plant fertilisers.