You may notice that while the UK has many unique products, a lot of their famous brands also produce the same products in North America. The difference is in the recipes and ingredients, resulting in different taste and quality.
The ingredients for products made in the UK are typically sourced from UK farms. As we all know, what we may think of as a standard crop or animal that can be grown or raised around the world, may grow and thrive differently depending on environmental factors. Dairy will taste different depending on the cows diet and lifestyle, while crops can taste different depending on soil composition, air quality and nutrition.
These factors influence the taste of the product, thus producing a strong or noticeable difference in taste and quality.