Security features were added the way it looks:

1. Paper quality -Banknotes are printed on special paper with raised lettering in some areas. Fake notes can sometimes feel limp or waxy
2. Print quality - Numbers, letters and colours are sharp and clear, whereas counterfeit notes may appear slightly blurred
3. Holographic strip - Pound symbol and figure 20 alternate when the note is tilted
4. Microlettering - Words printed below the portrait of the Queen are only visible with a magnifying glass
5. Metallic thread - Silver dashes on the back of the note become a continuous dark line when held up to the light
6. A see-through "register" shows a broken pound sign. The symbol becomes whole when held up to the light.
7. The watermark has been moved to a white panel to make it easier to find
Other - Some unpublicised "covert features" are designed to further deter counterfeiters
BBC NEWS | Business | New Adam Smith £20 note launched

Have a good one!:jointsmile: