The weighty tome that is the Collins guide to British Wildlife is available as an app.
You’ll probably always have your phone with you, and it’s your camera and your audio recorder and video recorder and social media port etc etc etc and now you can tell for certain your Chough from your Raven from your Jackdaw and confirm for certain whether that was an adder or a grass snake.
* note to the app developer (as if they read this !!!), a box for date and location of observations and link to social media platforms would make it a better hybrid outdoor e-learning (and sharing) tool.