FT doesn’t provide live price data, you can see live price data on other sites, e.g. investing.com or marketwatch…
The stop loss, limit orders etc will use live data but if you’re expecting it to work if the price drops for a fraction of a second then you’ll be out of luck, remember buy price and sell price are not the same, generally the buy price is higher than the sell price, what you generally see on charts is an average between these, so even if the chart shows your price was reached, the buy price provided to FT may have been higher so the order wouldn’t execute - The Basics of the Bid-Ask Spread
They could have live prices in the app, but this kind of data feed costs money - they can’t just look at yahoo and copy that because that is against the Yahoo terms of use.