Here are some of the most popular trading apps used in the UK:

1. eToro: eToro is a well-known social trading platform that offers a user-friendly interface and allows users to trade a variety of financial instruments, including stocks, cryptocurrencies, and CFDs. It also provides a social trading feature that enables users to follow and copy the trades of successful traders.
2. IG: IG is a reputable brokerage firm that offers a comprehensive trading app. It provides access to a wide range of markets, including stocks, indices, commodities, and more. The app offers advanced charting tools, real-time market data, and various order types.
3. Plus500: Plus500 is a popular trading platform that offers a user-friendly mobile app. It provides access to a wide range of CFD instruments, including stocks, indices, commodities, forex, and cryptocurrencies. The app features real-time quotes, customizable price alerts, and a simple interface.
4. Interactive Brokers: Interactive Brokers is a well-established brokerage firm that offers a powerful trading app. It provides access to a wide range of global markets and instruments, including stocks, options, futures, and more. The app offers advanced trading features, real-time market data, and extensive research tools.
5. Trading 212: Trading 212 is a mobile trading app that offers commission-free trading on a wide range of instruments, including stocks, ETFs, cryptocurrencies, and CFDs. The app provides a user-friendly interface, real-time market data, and a variety of order types.

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Note that you should do your own research before choosing a trading app. Compare the featured the different apps offer, read reviews from users, and look at the fees charged. Also consider the markets the apps offer, the ease of use, customer support and regulatory compliance.