Your absolute number of shares remains the same. You purchased each share at ÂŁ0.5133, and they are now valued (on paper) at ÂŁ0.7737 each. So the total value of your shareholding has increased by more than 50%.
Because a new investment round involves the creation of additional shares, the percentage of the company that each existing shareholder owns is reduced by a small amount, which is what people call “dilution”.