Investing a lump sum puts all the money in at one price, on one day. Regular investing puts in a fixed amount at intervals, often monthly and often because that's when the money arrives. Because the amount is fixed, it buys more shares when the price is low and fewer when it's high. That's pound-cost averaging, and it means your average cost per share is never above the average of the prices you bought at.
Neither is better in general; they trade different risks. A lump sum is exposed to the market sooner, which helps if prices rise and hurts if they fall straight afterwards. Regular investing spreads out the timing, but money waiting to go in sits in cash in the meantime, and each purchase may carry a dealing charge. In the app every purchase is a separate buy, and your cost basis is the average across all of them.
The average price was £7.67. Had the price only risen, a lump sum on day one would have bought more — and nobody knows the path in advance.
Educational content only. It is not personal financial advice.